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: ['8881', '1233', 'a', '7885', 'N', '2009', '7045', '3149', '9303', '975', '1569', 't', '2129', '3715', 'H', 'X', '9537', 'E', '7623', '707', 'C', '4479', '4389', '2043', '5415', 'J', 'k', 'b', 'O', '2351', 'c', 'Y', '2235', '2405', '4499', '7513', 's']

8881, 1233, 1, 7885, 14, 2009, 7045, 3149, 9303, 975, 1569, 20, 2129, 3715, 8, 24, 9537, 5, 7623, 707, 3, 4479, 4389, 2043, 5415, 10, 11, 2, 15, 2351, 3, 25, 2235, 2405, 4499, 7513, 19