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 cube_of_number(3) == "The cube of the number is: 27"
  assert cube_of_number(-2) == "The cube of the number is: -8"
  assert cube_of_number(0) == "The cube of the number is: 0"
output: def cube_of_number(number):
      cube = number ** 3
      return "The cube of the number is: " + str(cube)