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.*;
class Main {
    public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);
	int first = sc.nextInt();
	int second = sc.nextInt();
	String str = sc.next();
	if(str.length()!=(first+second+1)) {
	    System.out.println("No");
	    return;
	}
	for(int i = 0; i<str.length(); i++) {
	    char c = str.charAt(i);
	    if(i==first) {
		if(c!='-') {
		    System.out.println("No");
		    return;
		}
	    }else {
		if(c=='-') {
		    System.out.println("No");
		    return;
		}
	    }
	}
	System.out.println("Yes");
    }
}