Sum Seconds

import java.util.Scanner;

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

        int time1 = Integer.parseInt(scanner.nextLine());
        int time2 = Integer.parseInt(scanner.nextLine());
        int time3 = Integer.parseInt(scanner.nextLine());

        int time4=time1+time2+time3;

        if(time4 >= 10 && time4<60){
            System.out.println("0:" +time4);
        }else if(time4>=60 && time4<70){
            System.out.println("1:0" +(time4-60));
        }else if(time4>=70 && time4<120){
            System.out.println("1:" +(time4-60));
        }else if(time4 >= 120 && time4 < 130){
            System.out.println("2:0"+(time4-120));
        }else if(time4 >= 130 && time4 < 180){
            System.out.println("2:"+(time4-120));
        }else if(time4<10){
            System.out.println("0:" +0+time4);
        }

    }
}