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: ['N', '8821', 'U', 'X', 'N', '4125', 's', 'C', '9141']

SOLUTION: 14, 8821, 21, 24, 14, 4125, 19, 3, 9141

PROBLEM: ['1129', '9905', '2643', '2241', 'q']

SOLUTION: 1129, 9905, 2643, 2241, 17

PROBLEM: ['l', '7293', 'g', 'k', '2505', '4029', 'K', '845', '3323', 'S', '3035', 'R', '1567', 'y', 'z', 't', '8127', 'F', '3987', 'G', 'i', 'J', '4999', 'l']

SOLUTION:
12, 7293, 7, 11, 2505, 4029, 11, 845, 3323, 19, 3035, 18, 1567, 25, 26, 20, 8127, 6, 3987, 7, 9, 10, 4999, 12