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: ['O', 'i', 'w', '8355', '4805', '1645', 'Q', '6209', 'w', 'P', '1453', 't', 'c', 'F', '8713', '1717', 'S', '3641', '5141', '5209', 'F', 'c', 'K', 'o', '5361', 'n', '8729']

15, 9, 23, 8355, 4805, 1645, 17, 6209, 23, 16, 1453, 20, 3, 6, 8713, 1717, 19, 3641, 5141, 5209, 6, 3, 11, 15, 5361, 14, 8729