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 i,A,B;cin>>A>>B;
  string ss;cin>>ss;
  if(ss[A]=='-'){
    ss[A]='0';
  }else{
    cout<<"No";
    return 0;
  }
  for(i=0;i<=A+B;i++){
    if(ss[i]=='-'){
      cout<<"No";
      return 0;
    }
  }
  cout <<"Yes";}