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: ['X', 'F', 'o', 'i', 'z', '3875', 'R', '5985', '465', 'V', 'o', 'n', 'y', '8549', '7781', '8217', 'C', '8089', 'M', 'O', 'B', 'b']

24, 6, 15, 9, 26, 3875, 18, 5985, 465, 22, 15, 14, 25, 8549, 7781, 8217, 3, 8089, 13, 15, 2, 2