The postal code in Atcoder Kingdom is A+B+1 characters long, its (A+1)-th character is a hyphen `-`, and the other characters are digits from `0` through `9`.

You are given a string S. Determine whether it follows the postal code format in Atcoder Kingdom.

Constraints

* 1≤A,B≤5
* |S|=A+B+1
* S consists of `-` and digits from `0` through `9`.

Input

Input is given from Standard Input in the following format:


A B
S


Output

Print `Yes` if S follows the postal code format in AtCoder Kingdom; print `No` otherwise.

Examples

Input

3 4
269-6650


Output

Yes


Input

1 1
---


Output

No


Input

1 2
7444


Output

No
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();;
    char h = '-';
    char p = (s.charAt(a));
    int result1 = 0;
    int result2 = 0;
    int ss = s.length();

    if(h==p){
      result1 =1;
    }
    
    String ints = s.replaceAll("[^\\d]", "");
    if((ints.length())==(a+b)){
      result2 = 1;
    }
       
    if((result1 == 1) && (result2 == 1) && (ss== a+b+1 )){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
}