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: ['e', '5129', '5551', '2351', '8555', '6725', 'T', 'N', '2573', '7847', '2215', '6559', 'a', 'y', '9323', 'B', 'J']

5, 5129, 5551, 2351, 8555, 6725, 20, 14, 2573, 7847, 2215, 6559, 1, 25, 9323, 2, 10