Leap Year Exercise, programming in Python.

Here is the description of the problem.
Given the year number. You need to check if this year is a leap year. If it is, print LEAP, otherwise print COMMON.
The rules in Gregorian calendar are as follows:

a year is a leap year if its number is exactly divisible by 4 and is not exactly divisible by 100
a year is always a leap year if its number is exactly divisible by 400
Warning. The words LEAP and COMMON should be printed all caps.
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