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', '7723', '477', 'k', '2427', 'M', '7097', 'M', 'E', '6449', '8535', '8245', 'O', 's', '3397', '821', 'y', '6913']

15, 7723, 477, 11, 2427, 13, 7097, 13, 5, 6449, 8535, 8245, 15, 19, 3397, 821, 25, 6913