import java.util.Scanner;
import java.util.Arrays;
import java.util.Deque;
import java.util.ArrayDeque;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String c = sc.next();
        c = c.replaceAll("UTC", "");
        double C = Double.parseDouble(c);
        C = C - 9;
        a = (int) (a + C * 100 / 100);
        b = (int) (b + (C * 100 % 100) * 0.6);
        if (b < 0) {
            b = 60 + b;
            a = a - 1;
        }
        if (b >= 60) {
            b = b - 60;
            a = a + 1;

        }
        if (a >= 24) {
            a = a - 24;
        }
        if (a < 0) {
            a = a + 24;
        }
        System.out.println(a / 10 + "" + a % 10 + ":" + b / 10 + "" + b % 10 + "");
    }
}