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 n,m;
string a;
int main(){
    cin>>n>>m>>a;
    if(a[n]!='-') return cout<<"No"<<endl,0;
    for(int i=0;i<=n+m;i++){
        if(i==n) continue;
        if(a[i]<'0' || a[i]>'9') return cout<<"No"<<endl,0;
    }
    cout<<"Yes"<<endl;
    return 0;
}