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