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: ['7263', '7073', '7591', '2813', '5577', 'L', '6683', 'B', 'J', 'r', '1697', 'X', '9685', 'j', '5919', '9133', '145', '6221', '9191', 't', 'a', '8697', '8007', 'C', 'U', 'p', '1969', '1009', 'C', '587', '6449', 'm', '8669', '8387']

7263, 7073, 7591, 2813, 5577, 12, 6683, 2, 10, 18, 1697, 24, 9685, 10, 5919, 9133, 145, 6221, 9191, 20, 1, 8697, 8007, 3, 21, 16, 1969, 1009, 3, 587, 6449, 13, 8669, 8387