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: ['8645', '2707', 'X', 'w', 'L', '4161', '8953', '9299', '7503', 'N', '4891', '2145', 'u', '5043', '4683', '1073', 'f', 'w', 'o', '6267', 'W', 't', '6169', '6055', '5369', '615', 'u', 'O', '9401', '2291', 'i', 'W', 'F', '6533', '6051', '4271', 'm']

8645, 2707, 24, 23, 12, 4161, 8953, 9299, 7503, 14, 4891, 2145, 21, 5043, 4683, 1073, 6, 23, 15, 6267, 23, 20, 6169, 6055, 5369, 615, 21, 15, 9401, 2291, 9, 23, 6, 6533, 6051, 4271, 13