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: ['q', '1263', 'I', 'o', 'T', '5023', '5875', 'B', 'W', 'q', 'X', '551', '6231']

17, 1263, 9, 15, 20, 5023, 5875, 2, 23, 17, 24, 551, 6231