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: ['8199', 'b', '5495', '5341', 'H', 'd', '139', 'e', '9271', 'B', '5561', 'X', '3803', '9223', '4785', '3703', 'y', 'S', 'F', 'i', 'T', '3421', '1675', 'n', '4663', 'W', 'Y', '9707', '3207', 'i', 'b', 'j', 'm', 'k', 'J']

8199, 2, 5495, 5341, 8, 4, 139, 5, 9271, 2, 5561, 24, 3803, 9223, 4785, 3703, 25, 19, 6, 9, 20, 3421, 1675, 14, 4663, 23, 25, 9707, 3207, 9, 2, 10, 13, 11, 10