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;
	string s;
	cin>>a>>b>>s;

	if(s[a]!='-'){
		cout<<"No"<<endl;
		return 0;
	}

	for (int i = 0; i < a+b+1; i++){
		if(i==a)continue;
		if(s[i]<'0'||s[i]>'9'){
			cout<<"No"<<endl;
			return 0;
		}
	}

	cout<<"Yes"<<endl;

}
