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: ['K', 'E', '9495', 'x', 'D', 'r', '3137', 'Y', 'N', '3229', 'l']

11, 5, 9495, 24, 4, 18, 3137, 25, 14, 3229, 12