/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(calculateHoursFromMilliSeconds(412));
		System.out.println(calculateHoursFromMilliSeconds(60412));
	}
 
	  public static String calculateHoursFromMilliSeconds(long totalMilliSeconds) {
        long totalSeconds = totalMilliSeconds / 1000;
        long milli = totalMilliSeconds % 1000;
        long hours = totalSeconds / 3600;
        long minutes = (totalSeconds % 3600) / 60;
        long seconds = totalSeconds % 60;
        return String.format("%02d:%02d:%02d.%03d", hours, minutes, seconds, milli);
    }
}

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