SummingSeconds

import java.util.ArrayList;
import java.util.Scanner;

public class SecondsSumming {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int repeats = 3;
        int sum = 0;
        ArrayList<Integer> seconds = new ArrayList<>();
        for (int i = 0; i < repeats; i++){
            seconds.add(scan.nextInt());
        }
        sum = summingSeconds(seconds);
        convertingToTime(sum);
    }

    public static int summingSeconds(ArrayList<Integer> secondsToSum){
        int sum = 0;
        for (int i = 0; i < secondsToSum.size(); i++){
            sum+= secondsToSum.get(i);
        }
        return sum;
    }

    public static void convertingToTime(int timeInSeconds){
        int seconds = 0;
        int minutes = 0;
        int hours = 0;


        hours = timeInSeconds / 3600;
        minutes = (timeInSeconds - hours*3600) / 60;
        seconds = timeInSeconds % 60;



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