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: ['e', 'X', 'P', '1945', 'r', 'i', '7203', '3005', 'X']

5, 24, 16, 1945, 18, 9, 7203, 3005, 24