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;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = Integer.parseInt(sc.next());
		int b = Integer.parseInt(sc.next());
		String S = sc.next();

		for (int i=0; i<S.length(); i++){
			if (i == a){
				if (S.charAt(i) != '-'){
					System.out.println("No");
					return;
				}
			}else {
				if (!Character.isDigit(S.charAt(i))){
					System.out.println("No");
					return;
				}
			}
		}
		System.out.println("Yes");
		return;
    }
}
