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;
  
  int count =0;
  for(int i=0; i<a+b+1; i++){
  	if(s[i]=='-') count++;
  }
  if(s[a]=='-' && count==1) cout << "Yes" << endl;
	else cout << "No" << endl;
}