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 scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		String s = scan.next();
		String message = "No";
		try {
			Integer.parseInt(s.substring(0, a));
			Integer.parseInt(s.substring(a + 1));
			if(s.length() - a == b + 1) {
				if(s.charAt(a) == '-') {
					message = "Yes";
				} 
			}
		} catch(NumberFormatException e){
		}
		System.out.println(message);
	}
}