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 A,B;
char S[15];
int main()
{
	cin>>A>>B>>S;
	for(int i=0;i<=A+B;i++)
	{
		if(i!=A)
		{
			if(S[i]<'0'||S[i]>'9')
			{
				printf("No\n");
				return 0;	
			} 
		}
	}
	if(S[A]!='-')
	{
		printf("No\n");
		return 0;
	}
	printf("Yes\n");
	return 0;
} 