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: ['7531', '5825', '3699', 'u', '9203', '1695', 'K', 'I', 'b']

7531, 5825, 3699, 21, 9203, 1695, 11, 9, 2