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: ['f', 'M', 'O', 'E', '8461', 'M', 'L', '2791', '9837', '7275', '2251', 'n', '885', '5065', 'T', '1397', '9769', 'k', '1425', '7433', 'r', '2231', '8559', '2649', 'f', 'J', 'S', 'F', '7715', 'E', '4579', '117', '2659', 'A', '2857', 'J']

6, 13, 15, 5, 8461, 13, 12, 2791, 9837, 7275, 2251, 14, 885, 5065, 20, 1397, 9769, 11, 1425, 7433, 18, 2231, 8559, 2649, 6, 10, 19, 6, 7715, 5, 4579, 117, 2659, 1, 2857, 10