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: ['i', 'P', '2381', '6167', '4337', '2313', '3359', '975', 'N', '1665', '7605', '519', '2519', 'K', '1331', '735', '6589', 'O', '3469']

9, 16, 2381, 6167, 4337, 2313, 3359, 975, 14, 1665, 7605, 519, 2519, 11, 1331, 735, 6589, 15, 3469