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: ['1821', 'X', 'y', 'e', 'n', '9051', 'W', 'D', 'N', '571', '3109', 'r', 'R', '8361', '1611', '4547', 'g', '3199', '2141', '5617', '1261', 'S', '3931', 'z', 'U', '9119', '2385', '4925', 'n', 'f', 'e', 'w', '673', 'G', '9263', '1197', '8025', 'w', '5805']

1821, 24, 25, 5, 14, 9051, 23, 4, 14, 571, 3109, 18, 18, 8361, 1611, 4547, 7, 3199, 2141, 5617, 1261, 19, 3931, 26, 21, 9119, 2385, 4925, 14, 6, 5, 23, 673, 7, 9263, 1197, 8025, 23, 5805