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 <iostream>
using namespace std;

int main()
{
	int a,b;
	cin>>a>>b;
	string s;
	cin>>s;
	for(int i=0; i<s.size(); i++){
		if(i!=a){
			if(!isdigit(s[i])){
				cout<<"No"<<endl;
				return 0;
			}
		}else if(s[i]!='-'){
			cout<<"No"<<endl;
			return 0;
		}
	}
	cout<<"Yes"<<endl;
	
	return 0;
}