input: Write a python function to compare two numbers and print 'Hello World' if the first number is less than the second number, otherwise print 'Goodbye World'.
  assert compare_numbers(4, 8) == 'Hello World'
  assert compare_numbers(10, 5) == 'Goodbye World'
  assert compare_numbers(7, 7) == 'Goodbye World'
output: def compare_numbers(a, b):
      if a < b:
          return 'Hello World'
      else:
          return 'Goodbye World'