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 main() {
    int a, b;
    cin >> a >> b;
    string s;
    cin >> s;
    bool h = s[a] == '-';
    s.erase(begin(s) + a);
    bool n = all_of(begin(s), end(s), ::isdigit);
    cout << (h && n ? "Yes" : "No") << endl;
}
