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, b;
		String s;
		a = sc.nextInt();
		b = sc.nextInt();
		s = sc.next();

		for (int i = 0; i < a + b + 1; i++) {
			if(i != a && s.charAt(i) == '-') {
				System.out.print("No");
				return;
			} else if(i == a && s.charAt(i) != '-') {
				System.out.print("No");
				return;
			}
		}

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