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: ['3703', 'S', '1243', 'U', 'o', 'H', '4595', 'F', '3419', '4195', 'N', '5689', 'B', '6155', '6091', 'n', '4399', 'O', 'Y', '3871', '7637', 'X', '3405', 'j', '5999', 'o']

3703, 19, 1243, 21, 15, 8, 4595, 6, 3419, 4195, 14, 5689, 2, 6155, 6091, 14, 4399, 15, 25, 3871, 7637, 24, 3405, 10, 5999, 15