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: ['2581', 'X', '3249', '753', '5639']

SOLUTION: 2581, 24, 3249, 753, 5639

PROBLEM: ['y', '9573', 'j', '6697', '4179', '8985', '8999', 'R', '2585', 'h', 'p', '9407', '9575', '2639', '7655', '4683', 'Y']

SOLUTION: 25, 9573, 10, 6697, 4179, 8985, 8999, 18, 2585, 8, 16, 9407, 9575, 2639, 7655, 4683, 25

PROBLEM: ['K', '9983', 'x', 'd', '4281']

SOLUTION:
11, 9983, 24, 4, 4281