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;
	while(cin>>a>>b){
		cin>>s;
		int cnt=0;
		for(int i=0;i<s.length();++i){
			if(s[i]=='-')cnt++;	
		}
		if(s[a]=='-'&&cnt==1) cout<<"Yes";
		else cout<<"No";	
	}
	return 0;	
}