Clock

import java.util.Scanner;

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

        for (int i = 0; i < 24 ; i++) {
            for (int j = 0; j < 60 ; j++) {
                System.out.printf("%d : %d%n",i,j);

            }

        }

    }
}