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: ['2105', '1243', '1787', 'r', '8105', 'q', '7543', '6223', '1877', 'Q', '5631', 'v', '6797', '599', 's', '9911', '5263', '6929', '2641', '729', 'n', 'u', 'n', '1387', '8159', '4313', '2805', 'C', 'm', 'W', 'm', '6599', '3775', '4461', '5661', '9573', 'y', 'G', 'A']

2105, 1243, 1787, 18, 8105, 17, 7543, 6223, 1877, 17, 5631, 22, 6797, 599, 19, 9911, 5263, 6929, 2641, 729, 14, 21, 14, 1387, 8159, 4313, 2805, 3, 13, 23, 13, 6599, 3775, 4461, 5661, 9573, 25, 7, 1