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: ['3839', 'z', 'y', 'T', 'v', 'w', '2469', '2651', '499', '7407', 'O', 'Q', 'e']

SOLUTION: 3839, 26, 25, 20, 22, 23, 2469, 2651, 499, 7407, 15, 17, 5

PROBLEM: ['2087', '5779', 'O', 'F', '8401', '2949', 'e', 'z', '1513', 'z', '3941', '2587', 'w', 'p', 'i', '3233', 'D']

SOLUTION: 2087, 5779, 15, 6, 8401, 2949, 5, 26, 1513, 26, 3941, 2587, 23, 16, 9, 3233, 4

PROBLEM: ['U', 'O', '3095', 'k', '9199', '1409', '4567', '5345', '4685', '6661', '7659', 'K', '4731', '2157', 'l', 'Y', '8991', '2757', '8333', '8371', '4305']

SOLUTION:
21, 15, 3095, 11, 9199, 1409, 4567, 5345, 4685, 6661, 7659, 11, 4731, 2157, 12, 25, 8991, 2757, 8333, 8371, 4305