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', '8253', '8761', 'M', '9307', 'e', '165', '817', '8009', '4631', '3811', '9077', '9851', 'r', 'R', '8193']

5, 8253, 8761, 13, 9307, 5, 165, 817, 8009, 4631, 3811, 9077, 9851, 18, 18, 8193