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: ['9121', 'x', '3517', '3797', '9865', 'P', '2171', 'a', 'm', 'J', 'f', 'p', '5385']

SOLUTION: 9121, 24, 3517, 3797, 9865, 16, 2171, 1, 13, 10, 6, 16, 5385

PROBLEM: ['3527', '3843', '719', 'r', '8403', 'M', '3981', '9225', 'm', '5725', '8413', '7257', '6637', '5495', '261', '4853', 'L', 'J', '4141', 'D', '2687', '9113', '4357', 'W', 'S', '3439', 'c']

SOLUTION: 3527, 3843, 719, 18, 8403, 13, 3981, 9225, 13, 5725, 8413, 7257, 6637, 5495, 261, 4853, 12, 10, 4141, 4, 2687, 9113, 4357, 23, 19, 3439, 3

PROBLEM: ['r', 'Y', 'd']

SOLUTION:
18, 25, 4