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: ['6239', 'I', '6021', 'e', 'C', 'D', 'n', 'C', 'k', '5171', 'K', '3579', '1607', '7349', '3179', 'N', 'i', '8067', 'D', 'c', 'P', 'K', 'W', '2487', 'G', 'e', '2385', 'A', 'o']

SOLUTION: 6239, 9, 6021, 5, 3, 4, 14, 3, 11, 5171, 11, 3579, 1607, 7349, 3179, 14, 9, 8067, 4, 3, 16, 11, 23, 2487, 7, 5, 2385, 1, 15

PROBLEM: ['P', '8023', 'n', 'M', '9481', 'K', '9377', 'R', '2879', 'K', '9279', 'b', '9483', '3013', '6553', '381', 'f']

SOLUTION: 16, 8023, 14, 13, 9481, 11, 9377, 18, 2879, 11, 9279, 2, 9483, 3013, 6553, 381, 6

PROBLEM: ['y', '9555', '5053', 'H', '8695', 'V', '6605', 'v', 'I', '9983', 'q', 'V', '5519', '1223']

SOLUTION:
25, 9555, 5053, 8, 8695, 22, 6605, 22, 9, 9983, 17, 22, 5519, 1223