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() {

	int a,b;
	cin >> a >> b;
	string s;
	cin >> s;
	if(s.length()==a+b+1 and s[a]=='-'){
		for(int i=0;i<s.length();i++){
			if(s[i]=='-' and i!=a){
				cout << "No";
				return 0;
			}
		}
		cout << "Yes";
	}
	else
		cout << "No";
}