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: ['6559', 'E', 'V', '1997', '8897', 'w', '6533', '7595', 'A', 'u', '8333', '1731', 'S', 'M', 'e', 'C', 'O', 'q']

6559, 5, 22, 1997, 8897, 23, 6533, 7595, 1, 21, 8333, 1731, 19, 13, 5, 3, 15, 17