JavaExam21Sep_01_Timespan

import java.util.Scanner;


public class Exam21Sep14_01_Timespan {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        String[] end = input.nextLine().split(":");
        String[] start = input.nextLine().split(":");

        long endTime = Long.parseLong(end[2]) + Long.parseLong(end[1]) * 60 + Long.parseLong(end[0]) * 3600;
        long startTime = Long.parseLong(start[2]) + Long.parseLong(start[1]) * 60 + Long.parseLong(start[0]) * 3600;

        long timeSpan = endTime - startTime;

        long hours = timeSpan / 3600;
        long minutes = (timeSpan % 3600) / 60;
        long seconds = (timeSpan % 3600) % 60;

        System.out.printf("%d:%02d:%02d", hours, minutes, seconds);
    }
}