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: ['5985', '7461', '2543', 'h', 'G', 't', 'W', 'B', 'h', 'G', 'o', '5359', 'n', '2459', 'c', 'X', 'B', '9775', '255']

5985, 7461, 2543, 8, 7, 20, 23, 2, 8, 7, 15, 5359, 14, 2459, 3, 24, 2, 9775, 255