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: ['8461', 'I', '7547', 'C', 's', 'n', '639', '4229', 'a', '2931', '8523', 'Y', 'K', 'n', 's', 'g', '7795', '2707']

8461, 9, 7547, 3, 19, 14, 639, 4229, 1, 2931, 8523, 25, 11, 14, 19, 7, 7795, 2707