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,x=1;
    string s;
    cin>>a>>b>>s;
    for(int i=0;i<=a+b;i++){
        if((i<a||i>a)&&(s[i]>57||s[i]<48)) x=0;
        else if(i==a&&s[i]!='-') x=0;
    }
    if(x) cout<<"Yes"<<endl;
    else cout<<"No"<<endl;
}
