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: ['9999', '5909', '9037', 'B', 'q', 'e', 'E', 'T', '4343', 'J', '6391', '3915', '1583', '4235', 'b', 'N', '4011', '6407', '5313', 'I', '857', 'j', '8947', 'B', 'y', '6005', 'j', 'E', 'r', 'D']

9999, 5909, 9037, 2, 17, 5, 5, 20, 4343, 10, 6391, 3915, 1583, 4235, 2, 14, 4011, 6407, 5313, 9, 857, 10, 8947, 2, 25, 6005, 10, 5, 18, 4