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;
const int N=1e5;
char s[N];
int main(){
int x,y;
cin>>x>>y;
cin>>s;

for(int i=0;i<x+y+1; ++i){
if(i==x){
if(s[i]!='-'){
cout<<"No\n";
return 0;
}
}
else{
 if(!(s[i]<='9' && s[i]>='0')){
    cout<<"No\n";
    return 0;
 }

 }

}
cout<<"Yes\n";
}
