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
#include <bits/stdc++.h>

using namespace std;

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	int a, b;
	string s;
	cin >> a >> b;
	cin >> s;
	int k = 0;
	for (int i = 0; i < s.length(); ++i){
		if (s[i] == '-'){
			++k;
		}
	}
	cout << (k == 1 && s[a] == '-' ? "Yes":"No");	
	return 0;
}
