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>
#define int long long
using namespace std;

signed main() {
  int a,b;
  string s;
  int k=0;
  cin>>a>>b>>s;
  for(int i=0;i<a+b+1;i++){
    if(i==a){if(s[i]!='-')k++;}
    else{if((int)s[i]<48||(int)s[i]>57)k++;}
  }
  if(k)cout<<"No"<<endl;
  else cout<<"Yes"<<endl;
}
