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<cstdio>
int m,b,a;
char s[12];
int main()
{
	scanf("%d%d%s",&a,&b,s);
	for(b+=a+1;b--;)
		if(b==a && s[b]!='-' || b-a && (s[b]<'0' || s[b]>'9')) m=1;
	printf(m?"No":"Yes");
	return 0;
}