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.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();
        String S = sc.next();
        char[] ans = S.toCharArray();
        int A1 = 0;
        int A2 = 0;
        if ('-' == S.charAt(A + 1)) {
            for (int i = 0; A > i; i++) {
                if (0 <= ans[i] && 9 >= ans[i]) {

                } else {
                    A1 = 1;
                    break;
                }
            }
            for (int j = 0; B > j; j++) {
                if (0 <= ans[A + 1 + j] && 9 >= ans[A + 1 + j]) {

                } else {
                    A2 = 1;
                    break;
                }
            }
        } else {
            A1 = 1;
            A2 = 1;
        }
        if (A1 == 0 && A2 == 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}