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: ['i', 'A', '9171', 'T', '2183', '6737', '3093', '7573', '3311', 'u', '8567', '7985', 'K', '3143', 'r', '3911', '9539', '4031', 'D', '7671', '3463', 'x', '4827', 'e', 'G', '7567', 'R', '4947', 'M', 'F', '8107', 'c', '6839', 'q', 'f', '1869', '3363', '729', 'W', 'O']

9, 1, 9171, 20, 2183, 6737, 3093, 7573, 3311, 21, 8567, 7985, 11, 3143, 18, 3911, 9539, 4031, 4, 7671, 3463, 24, 4827, 5, 7, 7567, 18, 4947, 13, 6, 8107, 3, 6839, 17, 6, 1869, 3363, 729, 23, 15