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<stdio.h>
int main(void)
{
	int n,m,flg=1,i;
	char s[11];
	scanf("%d %d",&n,&m);
	scanf("%s",s);
	for(i=0;i<n;i++){
		if(s[i]=='-') flg=0;
	}
	for(i=n+1;i<n+m+1;i++){
		if(s[i]=='-') flg=0;
	}
	if(s[n]!='-') flg=0;
	if(flg==1) printf("Yes\n");
	else printf("No\n");
	return 0;
}