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', '809', '7705', 'Q', 'h', '6049', '7727', 'K', '1119', 'k', 'O', '5891', '387', '2019', '6591', '8957', '1241', 'q', '733', 's', 'X', 'T', 'B', 'x', '2849', '383', '1409', '2721']

21, 809, 7705, 17, 8, 6049, 7727, 11, 1119, 11, 15, 5891, 387, 2019, 6591, 8957, 1241, 17, 733, 19, 24, 20, 2, 24, 2849, 383, 1409, 2721