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: ['857', 'Y', '3681', 'c', '99', '1393', '5891', '9917', '2221', '5127']

857, 25, 3681, 3, 99, 1393, 5891, 9917, 2221, 5127