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: ['S', 'n', 'q', 'B', '5319', '4111', 'X', 's', '5681', 'i', '4845']

19, 14, 17, 2, 5319, 4111, 24, 19, 5681, 9, 4845