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: ['4211', 'y', 'x', 'u', 'x', '3173', '457', 'A', '9075', 'k', '8553', '3899', '5435', '2177', 'R', '699', 'X', 'G', '7367', 'o', 'y', '1335', 'Q', 'D', '3945', 'a', 'q', '5383']

4211, 25, 24, 21, 24, 3173, 457, 1, 9075, 11, 8553, 3899, 5435, 2177, 18, 699, 24, 7, 7367, 15, 25, 1335, 17, 4, 3945, 1, 17, 5383