Time for Nicholas#514
Vasylko knows that St. Nicholas starts to deliver gifts when it gets dark and finishes when it gets light. He wonders: how much time does Nicholas have to deliver all the gifts?
A single line contains t_1 and t_2 — the times when Nicholas starts and finishes delivering presents, in the format hh:mm:ss.
Print the time that St. Nicholas spends delivering gifts, in the format hh:mm:ss. It is guaranteed that this time does not exceed hours.
Example 1