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: ['D', '8201', 'o', 'O', 'a', 'a', '2475', 'k', '3099', '9789', 'f', 'i', 'k', 'H', 'f', 'Q', 'L', 'D', '3857', '645', 'g']

SOLUTION: 4, 8201, 15, 15, 1, 1, 2475, 11, 3099, 9789, 6, 9, 11, 8, 6, 17, 12, 4, 3857, 645, 7

PROBLEM: ['4541', 'D', 'm', 's', 'a', 'A', 'l', 'G', 'c', '405', 'S', 'R', '1729', 'o', '6847', '4663', 'y', '9141', '4985', '4311', '1361', 'D', 'i', '6023', '6693', '1531', '8755', 'Z', 'k', '1331', 'q', 'J']

SOLUTION:
4541, 4, 13, 19, 1, 1, 12, 7, 3, 405, 19, 18, 1729, 15, 6847, 4663, 25, 9141, 4985, 4311, 1361, 4, 9, 6023, 6693, 1531, 8755, 26, 11, 1331, 17, 10