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>
const int MAXC = 15;
char	S[MAXC]{ };
bool yes=true;
int A, B;

int main()
{
	scanf("%d%d %s", &A, &B, S);
	for(int i = A+B; i >= 0; --i)
		if(i != A)
			yes &= ('0' <= S[i]) && (S[i] <= '9');
		else
			yes &= (S[i] == '-');
	puts(yes ? "Yes" : "No");
	return 0;
}