while True: 
    year = int(input("Enter a year: "))

    if year%4 == 0:
        if year%100 == 0:
            if year%400 == 0:
                print("The year",year,"is a leap year")
        else:
            print("The year",year,"is a leap year")
    else:
        print("The year",year,"is not a leap year")