TimeConversion.java

import java.util.Scanner;

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        String sub="";
        int num = Integer.parseInt(s.substring(0,2));
        if(s.charAt(8)=='P'){
            num = num + 12;
            sub = ((num==24)?"12":num) + s.substring(2,8);
        }
        else{
            if(num==12)
                sub = "00" + s.substring(2,8);
            else
                sub = s.substring(0,8);
        }
        System.out.print(sub);
    }
}