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: ['e', '9383', '2239', '9457', '5779', '305', 'R', '3339', '3229', 'B', '7353', '7855']

5, 9383, 2239, 9457, 5779, 305, 18, 3339, 3229, 2, 7353, 7855