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(){
	int a,b,flag=0;
	char s[11];
	scanf("%d%d",&a,&b);
	scanf("%s",s);
	if(s[a]!='-'){
		printf("No\n");
		return 0;
	}
	for(int i=0;i<=a+b;i++){
		if(i!=a && (s[i]<'0' || s[i]>'9')){
			flag=1;
			break;
		}
	}
	printf("%s\n",flag?"No":"Yes");
	return 0;
}