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: ['6163', '779', 'T', '215', '1641', '3791', 'u', '333', 'e', '4973', 'T', '5733', 'd', 'm', 'd', 'L']

6163, 779, 20, 215, 1641, 3791, 21, 333, 5, 4973, 20, 5733, 4, 13, 4, 12