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', 'W', 'F', '9857', 'n', 'W', '5753', '6915', '1693', '6471', '2369', 'j', 's', 'J', 'h', '9961', 'v', 'g', '9629', '7855', '8215', 'F', 'j', '441', '8569', 'G', '1279']

5, 23, 6, 9857, 14, 23, 5753, 6915, 1693, 6471, 2369, 10, 19, 10, 8, 9961, 22, 7, 9629, 7855, 8215, 6, 10, 441, 8569, 7, 1279