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: ['8431', '9743', '1325', 's', 'F', 'B', '745', 'L', '8245', '5815', '2975', 'l', 't', '7049', 'k', '5531', 'c', '2675', 'r', '5491', '8807', '1613', 'O', '9111', 'q', '2887', '7499', '6161', '4387', 'o', 'G', '973', 'M', 'A', '663', '5783', '2337']

8431, 9743, 1325, 19, 6, 2, 745, 12, 8245, 5815, 2975, 12, 20, 7049, 11, 5531, 3, 2675, 18, 5491, 8807, 1613, 15, 9111, 17, 2887, 7499, 6161, 4387, 15, 7, 973, 13, 1, 663, 5783, 2337