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: ['O', 'R', '9909', 'w', 'A', '3721', '9899', '4153', '4095', 'X', '8285', 't', 'Y', 'u', 'Q', '1145', 'J', '7149', 'c', 'y', 'x', 'N', 'r', '2279', '8263', '9001', 'A', '5443', 'E', 'c', 'T']

15, 18, 9909, 23, 1, 3721, 9899, 4153, 4095, 24, 8285, 20, 25, 21, 17, 1145, 10, 7149, 3, 25, 24, 14, 18, 2279, 8263, 9001, 1, 5443, 5, 3, 20