#!/usr/bin/swift

/*
 06-time-conversion.swift 
 https://www.hackerrank.com/challenges/time-conversion

 Created by Fernando Fernandes on 2/27/16.
 Copyright © 2016 Bigorna. All rights reserved.
 http://stackoverflow.com/users/584548/ferunandu

 !!! INSTRUCTIONS !!!
 - chmod a+x 06-time-conversion.swift
 - ./06-time-conversion.swift
*/

import Foundation

var amPmTime = ""
var militaryTime: [String] = [String]()

func convertToMilitaryTime() {

    // Remove ":"
    militaryTime = amPmTime.characters.split(":").map(String.init)

    // Logic for "PM"
    if (militaryTime[2].containsString("P")) {
        if (Int(militaryTime[0]) != 12) {
            militaryTime[0] = String(Int(militaryTime[0])! + 12)
        }

    // Logic for "AM"
    } else {
        if (Int(militaryTime[0]) == 12) {
            militaryTime[0] = "00"
        }
    }

    // Remove "AM" or "PM"
    militaryTime[2] = militaryTime[2].substringToIndex(militaryTime[2].startIndex.advancedBy(2))
}

print("Type the time in AM/PM format (e.g.: 07:05:45PM), then press ENTER")
amPmTime = readLine()!
convertToMilitaryTime()
print(militaryTime.joinWithSeparator(":"))