package me.yukicoder.lv1;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.time.LocalTime;

public class No0525 {
	public static void main(String[] args) {
		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
			String[] input = br.readLine().split(":");
			LocalTime time = LocalTime.of(Integer.parseInt(input[0]), Integer.parseInt(input[1]));

			System.out.println(time.plusMinutes(5));
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}