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: ['527', 'B', '7565', 'u', 'T', '9271', '6681', 'u', '7949', 'C', '4009', 'I', 'Y', '4887', '6481', '2173', 'z']

527, 2, 7565, 21, 20, 9271, 6681, 21, 7949, 3, 4009, 9, 25, 4887, 6481, 2173, 26