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: ['523', 'q', '3917', '2439', '8599', 'l', 's', '1465', 'n', 'D', 'Z', '1901', 'G', '1639']

523, 17, 3917, 2439, 8599, 12, 19, 1465, 14, 4, 26, 1901, 7, 1639