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,i;
  string s;
  cin>>a>>b>>s;
  bool yubin=true;
  for(i=0;i<a+b+1;i++){
    if(i!=a && s[i]=='-')
      yubin=false;
    if(i==a && s[i]!='-')
      yubin=false;
  }
  if(yubin)
    cout<<"Yes";
  else cout<<"No";
}
