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: ['u', 'O', '57', '3565', 'G', 'C', '9895', '5207', '1197', 'i']

21, 15, 57, 3565, 7, 3, 9895, 5207, 1197, 9