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: ['F', 'A', 'A', '5729', '6717', '9171', '2245', '5017', 'T', '8013', '9991', 'o', 'n', 'e', 'n', 'G', 'G', '6581']

SOLUTION: 6, 1, 1, 5729, 6717, 9171, 2245, 5017, 20, 8013, 9991, 15, 14, 5, 14, 7, 7, 6581

PROBLEM: ['5481', 'W', '1285', 'U', '6155', '1505', 'Z']

SOLUTION: 5481, 23, 1285, 21, 6155, 1505, 26

PROBLEM: ['8015', '8443', '215', '1517', '9861', '1341', 'Y', '5921', 'f', 'f', '3697', '9291', '4931', '8807', 'x', 'i']

SOLUTION:
8015, 8443, 215, 1517, 9861, 1341, 25, 5921, 6, 6, 3697, 9291, 4931, 8807, 24, 9