import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author silviase
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AStationAndBus solver = new AStationAndBus();
        solver.solve(1, in, out);
        out.close();
    }

    static class AStationAndBus {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            char[] c = in.next().toCharArray();
            Arrays.sort(c);
            out.println(c[0] == c[c.length - 1] ? "No" : "Yes");
        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AStationAndBus solver = new AStationAndBus();
        solver.solve(1, in, out);
        out.close();
    }

    static class AStationAndBus {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            char[] c = in.next().toCharArray();
            Arrays.sort(c);
            out.println(c[0] == c[c.length - 1] ? "No" : "Yes");
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AStationAndBus solver = new AStationAndBus();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AStationAndBus solver = new AStationAndBus();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) AStationAndBus solver = new AStationAndBus(); solver new AStationAndBus() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class AStationAndBus {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            char[] c = in.next().toCharArray();
            Arrays.sort(c);
            out.println(c[0] == c[c.length - 1] ? "No" : "Yes");
        }

    } AStationAndBus public void solve(int testNumber, Scanner in, PrintWriter out) {
            char[] c = in.next().toCharArray();
            Arrays.sort(c);
            out.println(c[0] == c[c.length - 1] ? "No" : "Yes");
        } solve {
            char[] c = in.next().toCharArray();
            Arrays.sort(c);
            out.println(c[0] == c[c.length - 1] ? "No" : "Yes");
        } char[] c = in.next().toCharArray(); c in.next().toCharArray() in.next().toCharArray in.next() in.next in Arrays.sort(c) Arrays.sort Arrays c out.println(c[0] == c[c.length - 1] ? "No" : "Yes") out.println out c[0] == c[c.length - 1] ? "No" : "Yes" c[0] == c[c.length - 1] c[0] c 0 c[c.length - 1] c c.length - 1 c.length c c.length 1 "No" "Yes" int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AStationAndBus solver = new AStationAndBus();
        solver.solve(1, in, out);
        out.close();
    }

    static class AStationAndBus {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            char[] c = in.next().toCharArray();
            Arrays.sort(c);
            out.println(c[0] == c[c.length - 1] ? "No" : "Yes");
        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AStationAndBus solver = new AStationAndBus();
        solver.solve(1, in, out);
        out.close();
    }

    static class AStationAndBus {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            char[] c = in.next().toCharArray();
            Arrays.sort(c);
            out.println(c[0] == c[c.length - 1] ? "No" : "Yes");
        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author silviase
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AStationAndBus solver = new AStationAndBus();
        solver.solve(1, in, out);
        out.close();
    }

    static class AStationAndBus {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            char[] c = in.next().toCharArray();
            Arrays.sort(c);
            out.println(c[0] == c[c.length - 1] ? "No" : "Yes");
        }

    }
}

