input: Write a function to take an integer input from the user and print its cube.
  number = int(input("Please enter a number: "))
  cube = number**3
  print("The cube of the number is: " + str(cube))
  assert print_cube(3)==27
  assert print_cube(0)==0
  assert print_cube(-2)==-8
output: def print_cube(number):
      return number ** 3