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', 'b', '7641', 'b', '5283', '5353', 'L', '2189', '2343', 'O', '6489', '2211', 'n', 'M', '1831', '4259', 'h', 'q', '7739', '4199', 'y', '9459', 'x', 'b', '1287', '7385', 'X', '765', 'K', 'f']

3, 2, 7641, 2, 5283, 5353, 12, 2189, 2343, 15, 6489, 2211, 14, 13, 1831, 4259, 8, 17, 7739, 4199, 25, 9459, 24, 2, 1287, 7385, 24, 765, 11, 6