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: ['9427', 'J', '5843', '1837', '7805', 'S', '6881', '2987', 'd', '4331', 'O', '1797', 'j', 'P', '8403', 'q', '3347']

9427, 10, 5843, 1837, 7805, 19, 6881, 2987, 4, 4331, 15, 1797, 10, 16, 8403, 17, 3347