#include <iostream>
#include <cstdlib>

using namespace std;

class Clock{
  int hour;
  int minute;
  int second;
  int threshold;
public:
  Clock(int h, int m, int s, int t):hour(h),minute(m),second(s),threshold(t){};
  Clock():hour(1),minute(12),second(720),threshold(0){};
  bool checkSpace(){
    if( spaceBetween(hour,minute) > (14400 + threshold))
      return false;
    if( spaceBetween(hour,minute) < (14400 - threshold))
      return false;
    if( spaceBetween(minute,second) > (14400 + threshold))
      return false;
    if( spaceBetween(minute,second) < (14400 - threshold))
      return false;
    if( spaceBetween(second,hour) > (14400 + threshold))
      return false;
    if( spaceBetween(second,hour) < (14400 - threshold))
      return false;
    return true;
  }
  void advance(){
    hour += 1;
    if(hour == 43200)
      hour = 0;
    minute += 12;
    if(minute == 43200)
      minute = 0;
    second += 720;
    if(second == 43200)
      second = 0;
  }
  bool isNoon(){
    if (hour == 0)
      return true;
    return false;
  }
  void print(){
    cout << hour << ":" << minute << ":" << second << endl;
    cout << "Which would read on a clock as: " << endl;
    cout << hour / 3600 << ":" << minute / 720  << ":" << second / 720 << endl;
    cout << "Threshold: " << threshold << endl;
  }
  void upThreshold(){
    threshold++;
  }
  int spaceBetween(int one, int two){
    if( (one - two) == 0)
      return 0;
    else if ( (one - two) > 0){
      if ( (one - two) <= 21600)
	return one - two;
      else  
	return 43200 - (one - two);
    }
    else if ( (one - two) < 0){
      if ( (one - two) >= - 21600)
	return abs(one - two);
      else
	return 43200 - abs(one - two);
    }
  }
};

int main() {
  Clock time;

  while(!time.checkSpace()){
    if(time.isNoon())
      time.upThreshold();
    time.advance();
  }

  time.print();
  return 1;
}