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: ['8805', 'R', 'u', '459', 'L', '1699', '5337', 'j', '699', 'H', '9831', 'a', 'o', 'o', '8919', 'O', '9889', 'S', '5989', '855', '5739', '7497', '8759', '95', 'u']

8805, 18, 21, 459, 12, 1699, 5337, 10, 699, 8, 9831, 1, 15, 15, 8919, 15, 9889, 19, 5989, 855, 5739, 7497, 8759, 95, 21