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: ['O', '6049', '4915', '1573', '719', '2061', 'O', 'n', '6689', 'J', '4985', 'r', 'q', '6617', 'k', '2333', '183', '4549', '6053', '1075', '737', '6465', '5421']

SOLUTION: 15, 6049, 4915, 1573, 719, 2061, 15, 14, 6689, 10, 4985, 18, 17, 6617, 11, 2333, 183, 4549, 6053, 1075, 737, 6465, 5421

PROBLEM: ['H', 'f']

SOLUTION: 8, 6

PROBLEM: ['3155', 'M', 'e', 'y', 'B', '565', 'm', '497', '2985', '8481', '31', '459', 'o', 'a', '3457', '6371', '5769', 'y', '2737', 'b', '2853', 'I', '8797', '5799', 't', 'l', 'm', '8345', '2223', '9017']

SOLUTION:
3155, 13, 5, 25, 2, 565, 13, 497, 2985, 8481, 31, 459, 15, 1, 3457, 6371, 5769, 25, 2737, 2, 2853, 9, 8797, 5799, 20, 12, 13, 8345, 2223, 9017