TimePlus15minutes

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;
import java.util.Scanner;

/**
 * Created by Losh17 on 5.8.2017 г..
 */
public class TimePlus15minutes {
    public static void main(String[] args) {
        Locale.setDefault(new Locale("Us", "us"));
        Scanner console = new Scanner(System.in);
        Integer hour = Integer.parseInt(console.nextLine());
        Integer minutes = Integer.parseInt(console.nextLine());
        Integer temp = 0;
        NumberFormat numFormat = new DecimalFormat("#.##");
        if (minutes + 15 > 59){
            minutes = minutes + 15 - 60;
            hour = hour + 1;
        } else {
            minutes = minutes + 15;
        }
        if (hour > 23){
            hour = 0;
        }
        if (minutes < 10){
            System.out.println(hour + ":0" + minutes);
        } else {
            System.out.println(hour + ":" + minutes);
        }
    }
}