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: ['U', '3277', 'H', 'B', '1461', '4001', 'n', 'e', 'w', '911', '4577', 'S', 'P', 'W', 'd', 'W', 'K', '4021', 'y', '1185', '9555', '1663', '3303', 'G']

21, 3277, 8, 2, 1461, 4001, 14, 5, 23, 911, 4577, 19, 16, 23, 4, 23, 11, 4021, 25, 1185, 9555, 1663, 3303, 7