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: ['w', 'U', 'K', 'y', 'b', '6643', '1189', 'W', '8245', 'd', 'T', 'y', 'J', '3085', 'y', 'u']

23, 21, 11, 25, 2, 6643, 1189, 23, 8245, 4, 20, 25, 10, 3085, 25, 21