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: ['9973', '4501', '3257', '7393', '2041', '1173', 'f', '3299', '1399', 'S', 'a', '7829', '2557', '6051', '7063', '2537', 'k', 'b', 'W', '9133', 'd']

SOLUTION: 9973, 4501, 3257, 7393, 2041, 1173, 6, 3299, 1399, 19, 1, 7829, 2557, 6051, 7063, 2537, 11, 2, 23, 9133, 4

PROBLEM: ['G', '2013', 'Y', 'w', '1159', 'K', 'a', 's', 'A', 'l', '6537', 'G', '9437', 'X', '6451', 'N', 'c', '9713', '7353', 'U', 'n', 'M', 'e', '3901', 'q', 'V', '6123', 'I', 'j', 'O', 'r', 'R', '5925', '9391']

SOLUTION: 7, 2013, 25, 23, 1159, 11, 1, 19, 1, 12, 6537, 7, 9437, 24, 6451, 14, 3, 9713, 7353, 21, 14, 13, 5, 3901, 17, 22, 6123, 9, 10, 15, 18, 18, 5925, 9391

PROBLEM: ['8485', 'D', '3403', 'A', '1883', 'u']

SOLUTION:
8485, 4, 3403, 1, 1883, 21