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 number**3 == cube
output: def print_cube():
      number = int(input("Please enter a number: "))
      cube = number**3
      print("The cube of the number is: " + str(cube))