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 <iostream>
using namespace std;

int main(void){
    int a,b;
    string s,ans="Yes";
    cin>>a>>b>>s;
    for(int i=0; i<a+b+1; i++){
        if( (s[i]=='-' && i!=a)||(s[i]!='-' && i==a)){
            ans = "No";
        }
    }
    cout<<ans<<endl;
}