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)
{
	char n[12];
	int a,b,flg,cnt,i;
	scanf("%d %d",&a,&b);
	scanf("%s",n);
	flg=0; cnt=0;
	for(i=0;i<a+b+1;i++){
		if(n[a]=='-') flg=1;
		if(n[i]=='-') cnt++;
		if(cnt>=2) break;
	}
	if(cnt==1&&flg==1) printf("Yes\n");
	else printf("No\n");
	return 0;
}	