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: ['8467', 'x', '1721', 'S', '1977', '1017', 'X', '8631', '6769', '4663', 'Y', '6547', 'U', '4319', 'w', '785', 'K', 'w', 'o', 'P', 'L', 'Y']

8467, 24, 1721, 19, 1977, 1017, 24, 8631, 6769, 4663, 25, 6547, 21, 4319, 23, 785, 11, 23, 15, 16, 12, 25