input: Write a function that takes an integer input and prints its cube. The function should prompt the user to input an integer, compute its cube, and then print the result.
  
  assert cube_of_number(3)=="The cube of the number is: 27"
  assert cube_of_number(5)=="The cube of the number is: 125"
  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(num):
      return f"The cube of the number is: {num**3}"