Problem:
Score : 100 points

Problem Statement

How many hours do we have until New Year at M o'clock (24-hour notation) on 30th, December?

Constraints

1≤M≤23

M is an integer.

Input

Input is given from Standard Input in the following format:

M

Output

If we have x hours until New Year at M o'clock on 30th, December, print x.

Sample Input 1

21

Sample Output 1

27

We have 27 hours until New Year at 21 o'clock on 30th, December.

Sample Input 2

12

Sample Output 2

36

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.util.Scanner;
public class Main{
	public static void main(String args[])throws Exception{
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		String S = sc.next();
		Boolean M = true;
		char[] C = new char[S.length()];
		for(int i=0;i<S.length();i++) {
			C[i] = S.charAt(i);
			if(i == A && C[i] != '-') {
				M = false;
			}
			if(i != A && C[i] == '-') {
				M = false;
			}
		}
		if(M) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}
}