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: ['2023', 'C', '6129', 'J', 'M', '4381', 'g', '2989', 'f', 'c', 'J', 'G', '3091', 'j', '3209', 'B', 's']

2023, 3, 6129, 10, 13, 4381, 7, 2989, 6, 3, 10, 7, 3091, 10, 3209, 2, 19