// P.108 - 108

import java.util.Scanner;
class Time
{
	private int hrs, mins, secs;
	public Time() { hrs=0; mins=0; secs=0; }
	public Time(int h, int m, int s) { hrs=h; mins=m; secs=s; }
	public void set(int h, int m, int s) { hrs=h; mins=m; secs=s; }
	public void writeOut()
	{	if(hrs<10)	System.out.print("0");
		System.out.print(hrs + ":");
		if(mins<10)	System.out.print("0");
		System.out.print(mins + ":");
		if(secs<10)	System.out.print("0");
		System.out.print(secs);
	}
	public void increment()	// for 1 second
	{	secs ++;
		if(secs >= 60)
		{	secs = 0;
			mins ++;
			if(mins >= 60)
			{	mins = 0;
				hrs ++;
				if(hrs>=24)
					hrs = 0;
			}
		}
	}
	public boolean equal(Time other)
	{	return (hrs==other.hrs && mins==other.mins && secs==other.secs);
	}
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		int hh, mm, ss;
		// read hh
		System.out.print("Input hh: ");
		hh = input.nextInt();
		System.out.print("Input mm: ");
		mm = input.nextInt();
		System.out.print("Input ss: ");
		ss = input.nextInt();
		// declare an object now - 13:37:21?
		Time now = new Time(hh, mm, ss);
		//now.set(13, 37, 21);

		System.out.print("Input execution time in s: ");
		int N = input.nextInt();

		for(int i=0; i<N; i++)
			now.increment();
		now.writeOut();

		System.out.println("\n\nDone.\n\n\n");
	}
}