input: Write a function to add two numbers together and print the result. The function should take two arguments, both integers, and return their sum. If the function is called with 5 and 7, the result printed should be 12.
  
  def add(a, b):
      sum = a + b
      print(sum)
  
  add(5, 7)
output: def add(a, b):
      sum = a + b
      print(sum)