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 "iostream"

using namespace std;

int main()
{
	bool f = true;
	int a, b;
	cin >> a >> b;
	for (int i = 0; i < a + b + 1; i++) {
		char c;
		cin >> c;
		if (i == a) { if (c != '-') f = false; }
		else if (c<'0' || c>'9') f = false;
	}
	if (f) cout << "Yes";
	else cout << "No";
	return 0;
}