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: ['a', '9907', '6485', 'K', 'e', 'X', '687', '7687', '589', 'n', '7287', '9637']

SOLUTION: 1, 9907, 6485, 11, 5, 24, 687, 7687, 589, 14, 7287, 9637

PROBLEM: ['3345', '6477', 'H', '4143', 'E', 'g', '1607', '1405', '4485', '207', '3191', '2335', '6759', 'Z', '2385', '9181', 'I', '3283', '8735']

SOLUTION: 3345, 6477, 8, 4143, 5, 7, 1607, 1405, 4485, 207, 3191, 2335, 6759, 26, 2385, 9181, 9, 3283, 8735

PROBLEM: ['6881', 'F', '4759', '5797', '4879', '5761', '9913', '8509', 'c', 'X', 'U']

SOLUTION:
6881, 6, 4759, 5797, 4879, 5761, 9913, 8509, 3, 24, 21