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: ['3893', '871', '4431', '8253', 'u', '1579', 'I', '5665', '7581']

SOLUTION: 3893, 871, 4431, 8253, 21, 1579, 9, 5665, 7581

PROBLEM: ['A', 'i', '6381', 'Z', '9499', 'p', '3551', '3547', '4483', 'n', '5429', 'h', 'i', '245', '3501', '6881', 's', 'o', 'F', '9819', 'J', 'C', 'j', 'c', '7757', '8347', 'J', '7009', '6509', '5243', '8123', 'w', '891', 'u']

SOLUTION: 1, 9, 6381, 26, 9499, 16, 3551, 3547, 4483, 14, 5429, 8, 9, 245, 3501, 6881, 19, 15, 6, 9819, 10, 3, 10, 3, 7757, 8347, 10, 7009, 6509, 5243, 8123, 23, 891, 21

PROBLEM: ['C', '6545', 'Z', 'a', '139', '2721', '1379', 'Z', 'N', '6261', 'c', '5109', '6653', 'd', '1245', 'H', 'J', '5609', 'G', '3781', '6845', 'O', '6751']

SOLUTION:
3, 6545, 26, 1, 139, 2721, 1379, 26, 14, 6261, 3, 5109, 6653, 4, 1245, 8, 10, 5609, 7, 3781, 6845, 15, 6751