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 rep(i,a,n) for(int i=a;i<n;i++)
using namespace std;

int main(){
  int A,B;
  string S;
  cin >>A>>B>>S;
 
  string ans = "Yes";
  rep(i,0,A) if(S[i]=='-') ans = "No";
  if(S[A]!='-') ans = "No";
  rep(i,A+1,A+B+1) if(S[i]=='-') ans = "No";
  
  cout <<ans<< endl;
}