Write a function SumofEvens. This function must have one input argument that is a list of integers.

1) Calculate the sum of even numbers in the input list using while loop

2) Return the sum of even numbers contained in the input list

So far I know that I start like this:

def SumofEvens()

In the parenthesis it is saying that the function must have one input argument that is a list of integers. What is an input argument?