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: ['9805', '3483', 'C', 'J', '9453', 'a', '3557', 'R', 'K', 't', '9229', '7993']

9805, 3483, 3, 10, 9453, 1, 3557, 18, 11, 20, 9229, 7993