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[99];
int main(){
	scanf("%d%d%s",&a,&b,s);
	for(int i=0; i<a+b+1; i++){
		if(!(i==a && s[i] == '-' || i!=a && s[i]>='0' && s[i]<='9')){
			puts("No");
			return 0;
		}
	}
	puts("Yes");
	return 0;
}