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,d=1,e=0,f=1;
  string c;
  cin>>a>>b>>c;
  for(int i=0;i<=a+b;i++){
    if(i<a) if(c[i]=='-') d=0;	
    if(i==a) if(c[i]=='-') e=1;
    if(a<i) if(c[i]=='-') f=0;
  }
  if(d+e+f==3) cout<<"Yes";
  else cout<<"No";
  cout<<"\n";
}