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: ['X', 'T', '8553', '8551', '5119', '9069', '2105', 'Z', '4803', 'F', '6141', '4649', '4579', 'u', 'T', 'e', '9465', '5305', '749', '1697', 'j', 'O', 'M', 'N', 'g', '6673', 'x', 'r', '299']

24, 20, 8553, 8551, 5119, 9069, 2105, 26, 4803, 6, 6141, 4649, 4579, 21, 20, 5, 9465, 5305, 749, 1697, 10, 15, 13, 14, 7, 6673, 24, 18, 299