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: ['L', '7503', '1505', '1295', 'b', 'X', '4269', '239', '5539', '8341', 'c', 'q', 'A']

12, 7503, 1505, 1295, 2, 24, 4269, 239, 5539, 8341, 3, 17, 1