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: ['Y', 's', '4207', '1891', 'b', '8557', '9851', 'O', 'i', 'a', '2279', '8425', 't', 'w']

25, 19, 4207, 1891, 2, 8557, 9851, 15, 9, 1, 2279, 8425, 20, 23