Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['E', '5239', '227', '9889', 'C', 'g', '2703']

5, 5239, 227, 9889, 3, 7, 2703