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: ['8851', 'k', 'x', 'O', '9071', 'C', 'O', 'k', 'd', '5141', 'e', 'l', '4239', 'S', '2521', 'G', 'y', 'v', 't', '5275', '8869', '7553', '1857', '7843', '2203', 'v', '7867', 'D', '299', '2347', 'Z', 'K']

SOLUTION: 8851, 11, 24, 15, 9071, 3, 15, 11, 4, 5141, 5, 12, 4239, 19, 2521, 7, 25, 22, 20, 5275, 8869, 7553, 1857, 7843, 2203, 22, 7867, 4, 299, 2347, 26, 11

PROBLEM: ['2861', '3525', 'G', 'U', 'X', '9983', 's', '5745', '6063', '4995', 's', 'N', 'G', '1117', '687', '4153', 'F', 'n', 'C', '9525', 'i', '8925', '1055', '243', '2197', '2249', 't']

SOLUTION: 2861, 3525, 7, 21, 24, 9983, 19, 5745, 6063, 4995, 19, 14, 7, 1117, 687, 4153, 6, 14, 3, 9525, 9, 8925, 1055, 243, 2197, 2249, 20

PROBLEM: ['t', '6123', '735', '7473', '4895']

SOLUTION:
20, 6123, 735, 7473, 4895