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: ['O', '8489', 'a', '7329', 'B', '1947', 'V', '1031', 'y', '9733', 'Z', 'e', 'V', '9703', 'f', 'l', '1759', 'a', '6081', 'h', '2593', '597', 'P', '217']

15, 8489, 1, 7329, 2, 1947, 22, 1031, 25, 9733, 26, 5, 22, 9703, 6, 12, 1759, 1, 6081, 8, 2593, 597, 16, 217