import  calendar  as c
import random as r
import operator as op
import math
if __name__ == "__main__":
    # Returns True if year is a leap year, otherwise False.
    print (c.isleap(2019))
    i=["a","b","c"]
    print (r.choice(i))
    add = op.add
    print ( add(12,6))
    print (math.radians(90) + math.cos(90)+math.sin(45))