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() {
	int A, B;
	string S;
	cin >> A >> B >> S;
	for (int i = 0; i < A + B + 1; i++) {
		if (((i<A - 1 || i>A) && (S[i] == '-')) || (i == A && S[i] != '-')) {
			cout << "No" << endl;
			return 0;
		}
	}
	cout << "Yes" << endl;
}