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: Wrong Answer)

import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws FileNotFoundException {

        Scanner sc = new Scanner(System.in);

        long a = sc.nextInt();
        long b = sc.nextInt();
        String code = sc.next();
        boolean result = false;
        //System.out.println(code);

        if(a >= 1 && b <= 5){
            if(code.length() == Math.abs(a + b + 1)) {
                for(int i = 0; i < code.length(); i++){
                    char token = code.charAt(i);
                    //System.out.println(token);
                    if(i == a && token == '-') {
                        result = true;
                    } else if (i != a && !Character.isDigit(token)) {
                        result = false;
                    }
                }
            }
        }

        if(result){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    }
}