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: ['D', '8201', 'o', 'O', 'a', 'a', '2475', 'k', '3099', '9789', 'f', 'i', 'k', 'H', 'f', 'Q', 'L', 'D', '3857', '645', 'g']

SOLUTION: 4, 8201, 15, 15, 1, 1, 2475, 11, 3099, 9789, 6, 9, 11, 8, 6, 17, 12, 4, 3857, 645, 7

PROBLEM: ['8315', '3189', 'j', 'n', 't', 'U', '4163', 'z', '4013', '3159', '8169', '8649', '431', '6291', '1107', '9565', 'm', '1835', '3']

SOLUTION: 8315, 3189, 10, 14, 20, 21, 4163, 26, 4013, 3159, 8169, 8649, 431, 6291, 1107, 9565, 13, 1835, 3

PROBLEM: ['7795', 'Q', 'A', '2113', '2489', '6835', '2929', '3931', 'B', 'K', 'P', '1301', '9483', 'g', '6587', 'K', 'y', '1403', '6711', '9167', '2035', 'y', 'o', 'i', '4205', 'V', 'Y', '9697', '8693', '2751', '7131', 'z', '13', 'j', 'U', 'j', 'G', '2613', 'Y', 'j']

SOLUTION:
7795, 17, 1, 2113, 2489, 6835, 2929, 3931, 2, 11, 16, 1301, 9483, 7, 6587, 11, 25, 1403, 6711, 9167, 2035, 25, 15, 9, 4205, 22, 25, 9697, 8693, 2751, 7131, 26, 13, 10, 21, 10, 7, 2613, 25, 10