Timestamps

A scientist is performing an experiment. She has to note down the exact time at which **N** interesting events occur. Unfortunately, she is very tired and misses some digits while noting down the time. Also, she just forgets about the date. So at the end, there are **n** timestamp entries in **hh:mm:ss** format, where **hh** denotes the hour, **mm** minutes and **ss** the seconds. The time is in