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.Scanner;
 
class Main{
    public static void main(String[] args){
	Scanner scan = new Scanner(System.in);
	int a = scan.nextInt();
	int b = scan.nextInt();
	String s = scan.next();
	if(s.length() != a+b+1){
	    System.out.println("No");
	    return;
	}
	for(int i = 0; i < a; i++){
	    if('0' <= s.charAt(i) && s.charAt(i) <= '9'){
	    }else{
		    System.out.println("No");
		    return;
	    }
	}
	if(s.charAt(a) != '-'){
	    System.out.println("No");
	    return;
	}
	for(int i = a+1; i < s.length(); i++){
	    if('0' <= s.charAt(i) && s.charAt(i) <= '9'){
	    }else{
		    System.out.println("No");
		    return;
	    }
	}
	    System.out.println("Yes");
    }
}