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', '9797', 'E']

SOLUTION: 6, 9797, 5

PROBLEM: ['P', '8023', 'n', 'M', '9481', 'K', '9377', 'R', '2879', 'K', '9279', 'b', '9483', '3013', '6553', '381', 'f']

SOLUTION: 16, 8023, 14, 13, 9481, 11, 9377, 18, 2879, 11, 9279, 2, 9483, 3013, 6553, 381, 6

PROBLEM: ['2675', 'O', 'i', '9209', 'U', '3255']

SOLUTION:
2675, 15, 9, 9209, 21, 3255