import java.io.*;

public class No525{
    public static void main(String[] args) throws IOException{
        String[] time = new BufferedReader(new InputStreamReader(System.in)).readLine().split(":");
        int hour = Integer.parseInt(time[0]);
        int minute = Integer.parseInt(time[1]);
        secondGetupTime(hour, minute);
    }
    
    public static void secondGetupTime(int a, int b){
        b += 5;
        if (b/60 != 0) a++;
        b %= 60;
        a %= 24;
        if(a< 10 && b < 10)  System.out.println("0" + a + ":" + "0" + b); 
        else if(a < 10)  System.out.println("0"+ a + ":" + b);
        else if(b < 10)  System.out.println(a + ":" + "0" + b);
        else  System.out.println(a + ":" + b);
    }
}