import java.util.Scanner;

public class sum5 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int hour = Integer.parseInt(scanner.nextLine());
        int minutes = Integer.parseInt(scanner.nextLine());
        minutes = minutes+15;

        if (minutes >= 60)
        {
            hour = hour + 1;
            minutes = minutes - 60;
        }

        if (hour >= 24)
        {
            hour = hour - 24;
        }
        System.out.println(hour+":"+minutes);
    }
}