input: Write a function to multiply two input numbers and print the result. The function should take two parameters, `a` and `b`, and return the product. The function should also print the result directly.
  
  def multiply(a, b):
      result = a * b
      print(result)
  
  a = 3
  b = 4
  multiply(a, b)
  
  assert multiply(3, 4) == 12
  assert multiply(5, 5) == 25
  assert multiply(-1, 5) == -5
  assert multiply(10, 0) == 0
  assert multiply(7, 1) == 7
output: def multiply(a, b):
      result = a * b
      print(result)
      return result