p07_SecondsSum

import java.util.Scanner;
import java.lang.String;

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

        int a = Integer.parseInt(console.nextLine());
        int b = Integer.parseInt(console.nextLine());
        int c = Integer.parseInt(console.nextLine());

        int timeSum = a + b + c;

        if(timeSum <10){
            System.out.println("0:0" + timeSum);
        }else if(timeSum >= 10 && timeSum <= 59){
            System.out.println("0:" + timeSum);
        }else if(timeSum >= 60 && timeSum <= 119){
            System.out.println("1:0"+ (timeSum - 60));
        }else if(timeSum >= 120 && timeSum <= 179){
            System.out.println("2:0" + (timeSum - 120));
        }

    }
}