import java.io.InputStream;
import java.io.IOException;
import java.util.NoSuchElementException;
import static java.lang.System.*;

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());}
}

public class Main {
  public static void main(String[] args) {
    FastScanner fs = new FastScanner();

    int a = fs.nextInt();
    int b = fs.nextInt();
    String s = fs.next();

    String[] list = s.split("-", 0);
    if (list.length == 2 && list[0].length() == a && list[1].length() == b)
      out.println("Yes");
    else
      out.println("No");
  }
} import java.io.InputStream; InputStream java.io import java.io.IOException; IOException java.io import java.util.NoSuchElementException; NoSuchElementException java.util import static java.lang.System.*; import static java.lang.System.*; import static java.lang.System.*; 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++]; buffer[ptr++] buffer ptr++ ptr 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 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(); 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(); 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(); 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 fs = new FastScanner();

    int a = fs.nextInt();
    int b = fs.nextInt();
    String s = fs.next();

    String[] list = s.split("-", 0);
    if (list.length == 2 && list[0].length() == a && list[1].length() == b)
      out.println("Yes");
    else
      out.println("No");
  }
} Main public static void main(String[] args) {
    FastScanner fs = new FastScanner();

    int a = fs.nextInt();
    int b = fs.nextInt();
    String s = fs.next();

    String[] list = s.split("-", 0);
    if (list.length == 2 && list[0].length() == a && list[1].length() == b)
      out.println("Yes");
    else
      out.println("No");
  } main {
    FastScanner fs = new FastScanner();

    int a = fs.nextInt();
    int b = fs.nextInt();
    String s = fs.next();

    String[] list = s.split("-", 0);
    if (list.length == 2 && list[0].length() == a && list[1].length() == b)
      out.println("Yes");
    else
      out.println("No");
  } FastScanner fs = new FastScanner(); fs new FastScanner() int a = fs.nextInt(); a fs.nextInt() fs.nextInt fs int b = fs.nextInt(); b fs.nextInt() fs.nextInt fs String s = fs.next(); s fs.next() fs.next fs String[] list = s.split("-", 0); list s.split("-", 0) s.split s "-" 0 if (list.length == 2 && list[0].length() == a && list[1].length() == b)
      out.println("Yes");
    else
      out.println("No"); list.length == 2 && list[0].length() == a && list[1].length() == b list.length == 2 && list[0].length() == a && list[1].length() == b list.length == 2 list.length list list.length 2 list[0].length() == a list[0].length() list[0].length list[0] list 0 a list[1].length() == b list[1].length() list[1].length list[1] list 1 b out.println("Yes") out.println out "Yes" out.println("No") out.println out "No" String[] args args public class Main {
  public static void main(String[] args) {
    FastScanner fs = new FastScanner();

    int a = fs.nextInt();
    int b = fs.nextInt();
    String s = fs.next();

    String[] list = s.split("-", 0);
    if (list.length == 2 && list[0].length() == a && list[1].length() == b)
      out.println("Yes");
    else
      out.println("No");
  }
} public class Main {
  public static void main(String[] args) {
    FastScanner fs = new FastScanner();

    int a = fs.nextInt();
    int b = fs.nextInt();
    String s = fs.next();

    String[] list = s.split("-", 0);
    if (list.length == 2 && list[0].length() == a && list[1].length() == b)
      out.println("Yes");
    else
      out.println("No");
  }
} Main
import java.io.InputStream;
import java.io.IOException;
import java.util.NoSuchElementException;
import static java.lang.System.*;

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());}
}

public class Main {
  public static void main(String[] args) {
    FastScanner fs = new FastScanner();

    int a = fs.nextInt();
    int b = fs.nextInt();
    String s = fs.next();

    String[] list = s.split("-", 0);
    if (list.length == 2 && list[0].length() == a && list[1].length() == b)
      out.println("Yes");
    else
      out.println("No");
  }
}
