TASK 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.
PROBLEM: ['2621', '8811', '3613', '7469', 'O', 'P', '3429', '6091', 'l', '6905', '8189', '8933', 'l', '1745', 'c', 'a', '8665', '9733', '8263', 'X', '5065', 'W', '1837', 'K', 'k', '519', '7623']

SOLUTION: 2621, 8811, 3613, 7469, 15, 16, 3429, 6091, 12, 6905, 8189, 8933, 12, 1745, 3, 1, 8665, 9733, 8263, 24, 5065, 23, 1837, 11, 11, 519, 7623

PROBLEM: ['9295', '8345', 'X', 'k', 'F', '6699', 'r', '4137', '2777', 'C', 'U', 'Y', 'Q', '2983', 'J', '6111', '429', 'q', '8215', '275', 'O', 'Q']

SOLUTION: 9295, 8345, 24, 11, 6, 6699, 18, 4137, 2777, 3, 21, 25, 17, 2983, 10, 6111, 429, 17, 8215, 275, 15, 17

PROBLEM: ['q', 'B', 'U', '9387']

SOLUTION:
17, 2, 21, 9387