print("Please enter a year:")
year = int(input())

leapyear = year % 4
millennium = year % 100
millennium4 = year % 400

if millennium4 == 0:
    print("Leap year")
elif millennium == 0:
    print("not a leap year")
elif leapyear==0:
    print("leap year")
else:
    print("Not a leap year")