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: ['621', '1579', 'q', '5725', 'y', 'T', 'N', 'z', '7719', 'b', 'h', '9473', '6975', 'G', '1705', '7645', '4155', '111', 'u', 's']

621, 1579, 17, 5725, 25, 20, 14, 26, 7719, 2, 8, 9473, 6975, 7, 1705, 7645, 4155, 111, 21, 19