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: ['8259', '4931', '9171', '5523', 'G', '2807', 'b', '1417', '3773', 'M', '2703', 'y', '5775', '9493', '529', 'b', '9343', 'S']

8259, 4931, 9171, 5523, 7, 2807, 2, 1417, 3773, 13, 2703, 25, 5775, 9493, 529, 2, 9343, 19