Problem:
Score : 200 points

Problem Statement

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.

Sample Input 1

3 4
269-6650

Sample Output 1

Yes

The (A+1)-th character of S is -, and the other characters are digits from 0 through 9, so it follows the format.

Sample Input 2

1 1
---

Sample Output 2

No

S contains unnecessary -s other than the (A+1)-th character, so it does not follow the format.

Sample Input 3

1 2
7444

Sample Output 3

No

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.PrintWriter;
import java.util.Scanner;

public class Main {
    private static final int MAX = 5000+24;
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);
        while(in.hasNext()) {
            int a=in.nextInt(),b=in.nextInt();
            String code=in.next();
            boolean flag=code.length()==a+b+1;
            for(int i=0;i<code.length();i++){
                flag = flag & (i == a ? code.charAt(i) == '-' : Character.isDigit(code.charAt(i)));
            }
            out.println(flag?"Yes":"No");
            out.flush();
        }
        in.close();
        out.close();
    }

}