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: ['8131', '8409', 'T', 'F', '8493', 'F', '4953', 'y', '75', '3887', 'n', 'O', 'Q', '6145', '9723', '5179', '393']

8131, 8409, 20, 6, 8493, 6, 4953, 25, 75, 3887, 14, 15, 17, 6145, 9723, 5179, 393