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,e=0;
    cin>>a>>b;
    char c[a+b+1];
    for(int i=0;i<a+b+1;i++) cin>>c[i];
    for(int i=0;i<a+b+1;i++){
    if(c[i]>='0'&&c[i]<='9') e++;
    }
    if(a+b==e&&c[a]=='-') cout<<"Yes"<<endl;
    else cout<<"No"<<endl;
}
