Description

SZTU has just opened the newly built corridor!

Xiao Ming wants to know what time to get up to ensure that he will not be late for class if he takes this route.

So he participated in the opening of the corridor and recorded the time of departure and arrival.

Can you figure out how many minutes he needs to walk for class with coding?

Input

There are multiple test cases.

In each test case, two time points in hh:mm type are given.

Normally, Xiao Ming is unlikely to walk the corridor in the middle of the night.

So you can believe that the all the data are within the same day.

Output

Output the minutes Xiao Ming takes for each test case.

10:10 10:30
12:50 13:05

20
15