import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
     Scanner scanner = new Scanner(System.in);
        int hours = Integer.parseInt(scanner.nextLine());
        int minutes = Integer.parseInt(scanner.nextLine());
        if(minutes <= 44) {
           minutes = minutes + 15;
            System.out.printf( " %d:%d" , hours , minutes ) ;
        }
        else {
            hours = hours + 1 ;
            minutes = 15 - (60 - minutes );
            System.out.printf( "%d:%d" , hours , minutes) ;
        }
    }
}