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: ['859', '3569', '3487', '2349', '661', '2313', '6571', '7897', '317', 'd', 'e', '9773', '963', '2131', '2547', '2255', '8191', 'n']

859, 3569, 3487, 2349, 661, 2313, 6571, 7897, 317, 4, 5, 9773, 963, 2131, 2547, 2255, 8191, 14