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: ['8491', 'O', 'k', 'P', '9179', '9233', 't', '2831', 'A', 't', '5613', '5519', '3177', 'Z', '8547', '1127', 'a', '7741', '2433', 'W', 'i', '6845', '8011', '889', 'A', '7815', 'N', '8051', 'T', 'G', 'M']

8491, 15, 11, 16, 9179, 9233, 20, 2831, 1, 20, 5613, 5519, 3177, 26, 8547, 1127, 1, 7741, 2433, 23, 9, 6845, 8011, 889, 1, 7815, 14, 8051, 20, 7, 13