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: ['O', '6881', '759', '6693', 'i', 'c', '5921', 'z', 'w', '3775', '9997', 'e', '775']

SOLUTION: 15, 6881, 759, 6693, 9, 3, 5921, 26, 23, 3775, 9997, 5, 775

PROBLEM: ['155', '8891', 'F', 'T', 'C', '3477', 'L', 'l', '9191', '6815', 'c', 'M', '7365', '4757', '1439', 'B', 'Q', 'l', '4775', 'r', '7691', 'b', 'c', 'n', 'b', '4939', '1063', 'C', '1565', '3297', 'a', 'R', 'V', 'o']

SOLUTION: 155, 8891, 6, 20, 3, 3477, 12, 12, 9191, 6815, 3, 13, 7365, 4757, 1439, 2, 17, 12, 4775, 18, 7691, 2, 3, 14, 2, 4939, 1063, 3, 1565, 3297, 1, 18, 22, 15

PROBLEM: ['K', 'U', 'N', 'k', 'U', '1883', 'D', 'C', 'R', 'i', 'b', 'r', '5987', '7867', '2245', '2255', '5389', '3705', 'F', '3207', 'M', '1269', '2725', '8671', 'K', '1659', 'q']

SOLUTION:
11, 21, 14, 11, 21, 1883, 4, 3, 18, 9, 2, 18, 5987, 7867, 2245, 2255, 5389, 3705, 6, 3207, 13, 1269, 2725, 8671, 11, 1659, 17