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;
  bool ok=true;
  for(int i=0;i<s.size();++i){
    if(i==a) ok &= (s[i]=='-');
    else ok &= ('0'<=s[i] && s[i]<='9');
  }
  cout<<(ok?"Yes":"No")<<endl;
}