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: ['6149', '7835', 'Y', 'l', 'D', 'n', '191', '8281', 'I', '701', '309', 'i', 'z', '9317', '1483', 'Z', 'f', '8695', '461', '5799', 'I', '3669', '3965', '427', 'J', 'n', '1493', 'q']

6149, 7835, 25, 12, 4, 14, 191, 8281, 9, 701, 309, 9, 26, 9317, 1483, 26, 6, 8695, 461, 5799, 9, 3669, 3965, 427, 10, 14, 1493, 17