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: ['l', 'Y', 'L', '5279', 'j', 's', '7775', 'd', 'K', '8831', '8369', '5505', '3275', 'o', '6789', '1699', 'L', '4047', 'G', 'R', 'd', 'M', 'I', 'd', 's', '9857', 'T', 'L', 'D', '755', 'N', 'x']

12, 25, 12, 5279, 10, 19, 7775, 4, 11, 8831, 8369, 5505, 3275, 15, 6789, 1699, 12, 4047, 7, 18, 4, 13, 9, 4, 19, 9857, 20, 12, 4, 755, 14, 24