import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    String s = sc.next();
    String ss = s;
    ss=ss.substring(a,a+1);
    if(ss.equals("-")){
      s = s.replace("-","");
      int slen = s.length();
      if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      }
    }else{
      System.out.println("No");
    }
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    String s = sc.next();
    String ss = s;
    ss=ss.substring(a,a+1);
    if(ss.equals("-")){
      s = s.replace("-","");
      int slen = s.length();
      if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      }
    }else{
      System.out.println("No");
    }
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    String s = sc.next();
    String ss = s;
    ss=ss.substring(a,a+1);
    if(ss.equals("-")){
      s = s.replace("-","");
      int slen = s.length();
      if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      }
    }else{
      System.out.println("No");
    }
  } main {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    String s = sc.next();
    String ss = s;
    ss=ss.substring(a,a+1);
    if(ss.equals("-")){
      s = s.replace("-","");
      int slen = s.length();
      if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      }
    }else{
      System.out.println("No");
    }
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc String s = sc.next(); s sc.next() sc.next sc String ss = s; ss s ss=ss.substring(a,a+1) ss ss.substring(a,a+1) ss.substring ss a a+1 a 1 if(ss.equals("-")){
      s = s.replace("-","");
      int slen = s.length();
      if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      }
    }else{
      System.out.println("No");
    } ss.equals("-") ss.equals ss "-" {
      s = s.replace("-","");
      int slen = s.length();
      if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      }
    } s = s.replace("-","") s s.replace("-","") s.replace s "-" "" int slen = s.length(); slen s.length() s.length s if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      } slen == a + b slen a + b a b {
          System.out.println("Yes");
      } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
        System.out.println("No");
      } System.out.println("No") System.out.println System.out System System.out "No" {
      System.out.println("No");
    } System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    String s = sc.next();
    String ss = s;
    ss=ss.substring(a,a+1);
    if(ss.equals("-")){
      s = s.replace("-","");
      int slen = s.length();
      if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      }
    }else{
      System.out.println("No");
    }
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    String s = sc.next();
    String ss = s;
    ss=ss.substring(a,a+1);
    if(ss.equals("-")){
      s = s.replace("-","");
      int slen = s.length();
      if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      }
    }else{
      System.out.println("No");
    }
  }
} Main
import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    String s = sc.next();
    String ss = s;
    ss=ss.substring(a,a+1);
    if(ss.equals("-")){
      s = s.replace("-","");
      int slen = s.length();
      if(slen == a + b){
          System.out.println("Yes");
      }else{
        System.out.println("No");
      }
    }else{
      System.out.println("No");
    }
  }
}
