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: ['x', 'j', 'W', '2569', '7585', 'K', 'S', 'x', 'i', 'h', 'K', 'n', 'f', '4007', 'h', '1853', '4553', 'Q', '1569', 'U', 'C', 'r', '817']

24, 10, 23, 2569, 7585, 11, 19, 24, 9, 8, 11, 14, 6, 4007, 8, 1853, 4553, 17, 1569, 21, 3, 18, 817