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: ['4793', 'v', 'u', 'L', 'B', 'M', '5891', '5657', '1407', '6869', 'r', '6185', '1019', '4743', '2271', 'q', '9867', '2291', 'Y', '9505', 'S', '7295', '6741', '6253', '7821', 'O', '361', 's', 'I', 'k', '6497', 'd', 'Q', '989', 'a', '8903']

4793, 22, 21, 12, 2, 13, 5891, 5657, 1407, 6869, 18, 6185, 1019, 4743, 2271, 17, 9867, 2291, 25, 9505, 19, 7295, 6741, 6253, 7821, 15, 361, 19, 9, 11, 6497, 4, 17, 989, 1, 8903