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;

char a;
int n,m,f=1;

int main()
{
	cin>>n>>m;
	for(int i=1;i<=n+m+1;i++)
	{
		cin>>a;
		if(a=='-' && i!=n+1 || i==n+1 && a!='-') f=0;
	}
	puts(f?"Yes":"No");
	return 0;
}