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: ['Z', 'J', 'q', 'D', 'Z', 'Y', '1539', '6753', '8815', '3065', 'e', 'u', 'R', 'Y', '3973', '5953', '9209', '8725', '4275', '2885', 'T', '5181', 't', 'I', 'm', 'Z', '531', '8997', 's']

26, 10, 17, 4, 26, 25, 1539, 6753, 8815, 3065, 5, 21, 18, 25, 3973, 5953, 9209, 8725, 4275, 2885, 20, 5181, 20, 9, 13, 26, 531, 8997, 19