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;
	cin >> a >> b;
	string s;
	cin >> s;
	if(s[a] != '-')
	{
		puts("No");
		return 0;
	}
	for(int i=0;i<a+b+1;i++)
		if(i != a && (s[i]<'0' || s[i]>'9' ) )
		{
			puts("No");
			return 0;
		}
	puts("Yes");
	return 0;		
}