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: ['c', '4821', '2647', 'Y', 'm', 'O', '6605', 'l', 'k', 'm', 'x', 'V', '2221', '3315', 'K', '6483', '2315', 'A', 'a', '6911', '9245', 'O', '4451', 'j', '1127', 'O', '6735', 'E', 'A', 'u', 'G', 'C', '8103', 'p', '6927', 'A', '1413', '6793']

3, 4821, 2647, 25, 13, 15, 6605, 12, 11, 13, 24, 22, 2221, 3315, 11, 6483, 2315, 1, 1, 6911, 9245, 15, 4451, 10, 1127, 15, 6735, 5, 1, 21, 7, 3, 8103, 16, 6927, 1, 1413, 6793