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: ['W', 'M', '6851', 'R', 'Y', '5523', 'J', '7657', '2275', 'j', '953', '5529', '1715', '8893', '6561', 'B']

23, 13, 6851, 18, 25, 5523, 10, 7657, 2275, 10, 953, 5529, 1715, 8893, 6561, 2