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 str = sc.next();
	    char[] c = str.toCharArray();
	    for(int i=0; i<A+B+1; i++){
	    	if(i==A){
	    		if(!(String.valueOf(c[i]).equals("-"))){
	    			System.out.println("No");
	    			return;
	    		}
	    	}else{
	    		if(Character.isDigit(c[i])==false){
	    			System.out.println("No");
	    			return;
	    		}
	    	}
	    }

	    System.out.println("Yes");
    }
}