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: ['155', '8891', 'F', 'T', 'C', '3477', 'L', 'l', '9191', '6815', 'c', 'M', '7365', '4757', '1439', 'B', 'Q', 'l', '4775', 'r', '7691', 'b', 'c', 'n', 'b', '4939', '1063', 'C', '1565', '3297', 'a', 'R', 'V', 'o']

155, 8891, 6, 20, 3, 3477, 12, 12, 9191, 6815, 3, 13, 7365, 4757, 1439, 2, 17, 12, 4775, 18, 7691, 2, 3, 14, 2, 4939, 1063, 3, 1565, 3297, 1, 18, 22, 15