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
import java.io.*;
import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);
        
        final int A = Integer.parseInt(sc.next());
        final int B = Integer.parseInt(sc.next());
        String[] ss = sc.next().split("-");
        
        if (ss.length > 1
                && ss[0].length() == A
                && ss[0].matches("[0-9]+")
                && ss[1].length() == B
                && ss[1].matches("[0-9]+")) {
            out.println("Yes");
        } else {
            out.println("No");
        }
        
        out.flush();
    }
}