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: ['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: ['K', '4665', '7541', '2649', '9007', '3267', '929', 'B', 'K']

SOLUTION: 11, 4665, 7541, 2649, 9007, 3267, 929, 2, 11

PROBLEM: ['u', 'D', 'N', '3729']

SOLUTION:
21, 4, 14, 3729