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', '9341', 'o', 'K', '1603', 'g', '4071', 'e', '2741', 'U', '8611', '3565', 'o', 'K', '6483', '9851', 'h', 'A', 'H', 'g', '333']

15, 9341, 15, 11, 1603, 7, 4071, 5, 2741, 21, 8611, 3565, 15, 11, 6483, 9851, 8, 1, 8, 7, 333