package yukicoder;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc =  new Scanner(System.in);
		String moment = sc.nextLine();
		String[] spl = moment.split(":");
		int hour = Integer.parseInt(spl[0]);
		int minu = Integer.parseInt(spl[1]);
		minu+=5;
		if(minu >= 60){
			minu-=60;
			hour++;
		}
		hour%=24;
		String[] prefix = {"",""};
		if(hour < 10){
			prefix[0] = "0";
		}
		if(minu < 10){
			prefix[1] = "0";
		}
		System.out.println(prefix[0] + hour + ":" + prefix[1] + minu);
	}

}