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: ['A', '6307', 'n', 'U', '5179', 'X', 'N', '767', '8273', 'r', '7055', '9371', 'u', '7479', 'p', '9961', '3547', 'X', '8445']

SOLUTION: 1, 6307, 14, 21, 5179, 24, 14, 767, 8273, 18, 7055, 9371, 21, 7479, 16, 9961, 3547, 24, 8445

PROBLEM: ['5757', 'V', 'J', '255', 'I', 'V', 'a', '9533', 'h', '8741', 'b', 'O', 'r', 'Z', 'l', '3043', 'q', 'j', '1205', 'q', 'd', '5299', '8083', 'J', 'I', '3857', '1819', '1695', '1847', 'E', '2043', '4457', 'V', 'd', 't', 'E', 'r']

SOLUTION: 5757, 22, 10, 255, 9, 22, 1, 9533, 8, 8741, 2, 15, 18, 26, 12, 3043, 17, 10, 1205, 17, 4, 5299, 8083, 10, 9, 3857, 1819, 1695, 1847, 5, 2043, 4457, 22, 4, 20, 5, 18

PROBLEM: ['N', '2249', '6463', '2809', 'D', 'O', 'Z', '4209', 'x', 'r', 'G', '3013', '2885', '5225', 'c', 'p', 'H', 'j', 'K', 'L', 'Y', 'H', 'l', '721', '4731', '1275', 'P', '5575', 'x', 'g', '7881']

SOLUTION:
14, 2249, 6463, 2809, 4, 15, 26, 4209, 24, 18, 7, 3013, 2885, 5225, 3, 16, 8, 10, 11, 12, 25, 8, 12, 721, 4731, 1275, 16, 5575, 24, 7, 7881