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', '3997', '7479', '8363', '2575', 'H', '845', 'Q', 'J', 'J', 'X', 'J', 's', '607', 'O', 'X', '2615', 'y', '837', 'I', 'Z', 'U', 'R', '4737', 'v', 'F', 'D', 'D', 'P', 'f', '9513', 'N', 'a', '5533', 'U', '1933', 'B', '4477', 'L']

19, 3997, 7479, 8363, 2575, 8, 845, 17, 10, 10, 24, 10, 19, 607, 15, 24, 2615, 25, 837, 9, 26, 21, 18, 4737, 22, 6, 4, 4, 16, 6, 9513, 14, 1, 5533, 21, 1933, 2, 4477, 12