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: ['4543', 'e', '9589', 'h', 'a', '3761', '3917', '5703', 'Y', '2331', 'o', '6267', 'o', '3555', '8543', '7181', '9155', '6607', '9017', 'X']

SOLUTION: 4543, 5, 9589, 8, 1, 3761, 3917, 5703, 25, 2331, 15, 6267, 15, 3555, 8543, 7181, 9155, 6607, 9017, 24

PROBLEM: ['3731', 'V', 'C', 'S', '8601', '2753', '9015', '7233', '3903', 'v', '9723', 'J', '5227', 'N', 'S', 'f']

SOLUTION: 3731, 22, 3, 19, 8601, 2753, 9015, 7233, 3903, 22, 9723, 10, 5227, 14, 19, 6

PROBLEM: ['l', 'C', '3723', 'O', '2269', 'P', '4951', 'b', '1635', '149', '7665']

SOLUTION:
12, 3, 3723, 15, 2269, 16, 4951, 2, 1635, 149, 7665