import java.io.IOException;
import java.io.InputStream;
import java.util.*;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import static java.lang.Math.E;
import static java.lang.Math.PI;
import static java.lang.Math.abs;
import static java.lang.Math.acos;
import static java.lang.Math.asin;
import static java.lang.Math.atan2;
import static java.lang.Math.atan;
import static java.lang.Math.cos;
import static java.lang.Math.exp;
import static java.lang.Math.hypot;
import static java.lang.Math.log;
import static java.lang.Math.max;
import static java.lang.Math.min;
import static java.lang.Math.sin;
import static java.lang.Math.sqrt;
import static java.lang.Math.tan;
import static java.lang.String.format;
import static java.lang.System.currentTimeMillis;
import static java.math.BigInteger.ONE;
import static java.math.BigInteger.TEN;
import static java.math.BigInteger.ZERO;
import static java.util.Arrays.fill;
import static java.util.Arrays.sort;
import static java.util.Collections.sort;
import static java.util.Comparator.reverseOrder;
import static java.util.Objects.isNull;
import static java.util.Objects.nonNull;

public class Main {
    public static void main(String[] args) {
        FastScanner fsc = new FastScanner();
        char[] s = fsc.next().toCharArray();
        System.out.println(s[0] == s[1] && s[1] == s[2] ? "No" : "Yes");
    }
}


class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte()) {
            return buffer[ptr++];
        } else {
            return -1;
        }
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
            ptr++;
        }
        return hasNextByte();
    }

    public String next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
            throw new NumberFormatException();
        }
        return (int) nl;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }
} import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.util.*; util.* java import java.util.Map.Entry; Entry java.util.Map import java.util.NoSuchElementException; NoSuchElementException java.util import static java.lang.Math.E; import static java.lang.Math.E; import static java.lang.Math.E; import static java.lang.Math.PI; import static java.lang.Math.PI; import static java.lang.Math.PI; import static java.lang.Math.abs; import static java.lang.Math.abs; import static java.lang.Math.abs; import static java.lang.Math.acos; import static java.lang.Math.acos; import static java.lang.Math.acos; import static java.lang.Math.asin; import static java.lang.Math.asin; import static java.lang.Math.asin; import static java.lang.Math.atan2; import static java.lang.Math.atan2; import static java.lang.Math.atan2; import static java.lang.Math.atan; import static java.lang.Math.atan; import static java.lang.Math.atan; import static java.lang.Math.cos; import static java.lang.Math.cos; import static java.lang.Math.cos; import static java.lang.Math.exp; import static java.lang.Math.exp; import static java.lang.Math.exp; import static java.lang.Math.hypot; import static java.lang.Math.hypot; import static java.lang.Math.hypot; import static java.lang.Math.log; import static java.lang.Math.log; import static java.lang.Math.log; import static java.lang.Math.max; import static java.lang.Math.max; import static java.lang.Math.max; import static java.lang.Math.min; import static java.lang.Math.min; import static java.lang.Math.min; import static java.lang.Math.sin; import static java.lang.Math.sin; import static java.lang.Math.sin; import static java.lang.Math.sqrt; import static java.lang.Math.sqrt; import static java.lang.Math.sqrt; import static java.lang.Math.tan; import static java.lang.Math.tan; import static java.lang.Math.tan; import static java.lang.String.format; import static java.lang.String.format; import static java.lang.String.format; import static java.lang.System.currentTimeMillis; import static java.lang.System.currentTimeMillis; import static java.lang.System.currentTimeMillis; import static java.math.BigInteger.ONE; import static java.math.BigInteger.ONE; import static java.math.BigInteger.ONE; import static java.math.BigInteger.TEN; import static java.math.BigInteger.TEN; import static java.math.BigInteger.TEN; import static java.math.BigInteger.ZERO; import static java.math.BigInteger.ZERO; import static java.math.BigInteger.ZERO; import static java.util.Arrays.fill; import static java.util.Arrays.fill; import static java.util.Arrays.fill; import static java.util.Arrays.sort; import static java.util.Arrays.sort; import static java.util.Arrays.sort; import static java.util.Collections.sort; import static java.util.Collections.sort; import static java.util.Collections.sort; import static java.util.Comparator.reverseOrder; import static java.util.Comparator.reverseOrder; import static java.util.Comparator.reverseOrder; import static java.util.Objects.isNull; import static java.util.Objects.isNull; import static java.util.Objects.isNull; import static java.util.Objects.nonNull; import static java.util.Objects.nonNull; import static java.util.Objects.nonNull; public class Main {
    public static void main(String[] args) {
        FastScanner fsc = new FastScanner();
        char[] s = fsc.next().toCharArray();
        System.out.println(s[0] == s[1] && s[1] == s[2] ? "No" : "Yes");
    }
} Main public static void main(String[] args) {
        FastScanner fsc = new FastScanner();
        char[] s = fsc.next().toCharArray();
        System.out.println(s[0] == s[1] && s[1] == s[2] ? "No" : "Yes");
    } main {
        FastScanner fsc = new FastScanner();
        char[] s = fsc.next().toCharArray();
        System.out.println(s[0] == s[1] && s[1] == s[2] ? "No" : "Yes");
    } FastScanner fsc = new FastScanner(); fsc new FastScanner() char[] s = fsc.next().toCharArray(); s fsc.next().toCharArray() fsc.next().toCharArray fsc.next() fsc.next fsc System.out.println(s[0] == s[1] && s[1] == s[2] ? "No" : "Yes") System.out.println System.out System System.out s[0] == s[1] && s[1] == s[2] ? "No" : "Yes" s[0] == s[1] && s[1] == s[2] s[0] == s[1] s[0] s 0 s[1] s 1 s[1] == s[2] s[1] s 1 s[2] s 2 "No" "Yes" String[] args args class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte()) {
            return buffer[ptr++];
        } else {
            return -1;
        }
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
            ptr++;
        }
        return hasNextByte();
    }

    public String next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
            throw new NumberFormatException();
        }
        return (int) nl;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }
} FastScanner private final InputStream in = System.in; in System.in System System.in private final byte[] buffer = new byte[1024]; buffer new byte[1024] 1024 private int ptr = 0; ptr 0 private int buflen = 0; buflen 0 private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    } hasNextByte {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    } if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        } ptr < buflen ptr buflen {
            return true;
        } return true; true {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        } ptr = 0 ptr 0 try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } IOException e {
                e.printStackTrace();
            } e.printStackTrace() e.printStackTrace e {
                buflen = in.read(buffer);
            } buflen = in.read(buffer) buflen in.read(buffer) in.read in buffer if (buflen <= 0) {
                return false;
            } buflen <= 0 buflen 0 {
                return false;
            } return false; false return true; true private int readByte() {
        if (hasNextByte()) {
            return buffer[ptr++];
        } else {
            return -1;
        }
    } readByte {
        if (hasNextByte()) {
            return buffer[ptr++];
        } else {
            return -1;
        }
    } if (hasNextByte()) {
            return buffer[ptr++];
        } else {
            return -1;
        } hasNextByte() hasNextByte {
            return buffer[ptr++];
        } return buffer[ptr++]; buffer[ptr++] buffer ptr++ ptr {
            return -1;
        } return -1; -1 1 private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    } isPrintableChar {
        return 33 <= c && c <= 126;
    } return 33 <= c && c <= 126; 33 <= c && c <= 126 33 <= c 33 c c <= 126 c 126 int c c public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
            ptr++;
        }
        return hasNextByte();
    } hasNext {
        while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
            ptr++;
        }
        return hasNextByte();
    } while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
            ptr++;
        } hasNextByte() && !isPrintableChar(buffer[ptr]) hasNextByte() hasNextByte !isPrintableChar(buffer[ptr]) isPrintableChar(buffer[ptr]) isPrintableChar buffer[ptr] buffer ptr {
            ptr++;
        } ptr++ ptr return hasNextByte(); hasNextByte() hasNextByte public String next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    } next {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    } if (!hasNext()) {
            throw new NoSuchElementException();
        } !hasNext() hasNext() hasNext {
            throw new NoSuchElementException();
        } throw new NoSuchElementException(); new NoSuchElementException() StringBuilder sb = new StringBuilder(); sb new StringBuilder() int b = readByte(); b readByte() readByte while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        } isPrintableChar(b) isPrintableChar b {
            sb.appendCodePoint(b);
            b = readByte();
        } sb.appendCodePoint(b) sb.appendCodePoint sb b b = readByte() b readByte() readByte return sb.toString(); sb.toString() sb.toString sb public long nextLong() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    } nextLong {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    } if (!hasNext()) {
            throw new NoSuchElementException();
        } !hasNext() hasNext() hasNext {
            throw new NoSuchElementException();
        } throw new NoSuchElementException(); new NoSuchElementException() long n = 0; n 0 boolean minus = false; minus false int b = readByte(); b readByte() readByte if (b == '-') {
            minus = true;
            b = readByte();
        } b == '-' b '-' {
            minus = true;
            b = readByte();
        } minus = true minus true b = readByte() b readByte() readByte if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        } b < '0' || '9' < b b < '0' b '0' '9' < b '9' b {
            throw new NumberFormatException();
        } throw new NumberFormatException(); new NumberFormatException() while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        } true {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        } if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            } '0' <= b && b <= '9' '0' <= b '0' b b <= '9' b '9' {
                n *= 10;
                n += b - '0';
            } n *= 10 n 10 n += b - '0' n b - '0' b '0' if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            } b == -1 || !isPrintableChar(b) b == -1 b -1 1 !isPrintableChar(b) isPrintableChar(b) isPrintableChar b {
                return minus ? -n : n;
            } return minus ? -n : n; minus ? -n : n minus -n n n {
                throw new NumberFormatException();
            } throw new NumberFormatException(); new NumberFormatException() b = readByte() b readByte() readByte public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
            throw new NumberFormatException();
        }
        return (int) nl;
    } nextInt {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
            throw new NumberFormatException();
        }
        return (int) nl;
    } long nl = nextLong(); nl nextLong() nextLong if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
            throw new NumberFormatException();
        } nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE nl < Integer.MIN_VALUE nl Integer.MIN_VALUE Integer Integer.MIN_VALUE nl > Integer.MAX_VALUE nl Integer.MAX_VALUE Integer Integer.MAX_VALUE {
            throw new NumberFormatException();
        } throw new NumberFormatException(); new NumberFormatException() return (int) nl; (int) nl public double nextDouble() {
        return Double.parseDouble(next());
    } nextDouble {
        return Double.parseDouble(next());
    } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next public class Main {
    public static void main(String[] args) {
        FastScanner fsc = new FastScanner();
        char[] s = fsc.next().toCharArray();
        System.out.println(s[0] == s[1] && s[1] == s[2] ? "No" : "Yes");
    }
} public class Main {
    public static void main(String[] args) {
        FastScanner fsc = new FastScanner();
        char[] s = fsc.next().toCharArray();
        System.out.println(s[0] == s[1] && s[1] == s[2] ? "No" : "Yes");
    }
} Main
import java.io.IOException;
import java.io.InputStream;
import java.util.*;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import static java.lang.Math.E;
import static java.lang.Math.PI;
import static java.lang.Math.abs;
import static java.lang.Math.acos;
import static java.lang.Math.asin;
import static java.lang.Math.atan2;
import static java.lang.Math.atan;
import static java.lang.Math.cos;
import static java.lang.Math.exp;
import static java.lang.Math.hypot;
import static java.lang.Math.log;
import static java.lang.Math.max;
import static java.lang.Math.min;
import static java.lang.Math.sin;
import static java.lang.Math.sqrt;
import static java.lang.Math.tan;
import static java.lang.String.format;
import static java.lang.System.currentTimeMillis;
import static java.math.BigInteger.ONE;
import static java.math.BigInteger.TEN;
import static java.math.BigInteger.ZERO;
import static java.util.Arrays.fill;
import static java.util.Arrays.sort;
import static java.util.Collections.sort;
import static java.util.Comparator.reverseOrder;
import static java.util.Objects.isNull;
import static java.util.Objects.nonNull;

public class Main {
    public static void main(String[] args) {
        FastScanner fsc = new FastScanner();
        char[] s = fsc.next().toCharArray();
        System.out.println(s[0] == s[1] && s[1] == s[2] ? "No" : "Yes");
    }
}


class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte()) {
            return buffer[ptr++];
        } else {
            return -1;
        }
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
            ptr++;
        }
        return hasNextByte();
    }

    public String next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
            throw new NumberFormatException();
        }
        return (int) nl;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }
}
