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: ['l', 'F', 'o', '8761', 'o', 't', '2151', '1421', '9381', 'o', '8687', 'i', 'B', '7911', '2759', 'M', '4555', '3747', '145', 'W']

SOLUTION: 12, 6, 15, 8761, 15, 20, 2151, 1421, 9381, 15, 8687, 9, 2, 7911, 2759, 13, 4555, 3747, 145, 23

PROBLEM: ['o', '8137', 'V', 'q', '2543']

SOLUTION: 15, 8137, 22, 17, 2543

PROBLEM: ['Y', 'k', '1847', '7437', 'c', 'd', '787', 'n', '2499', '6029', 'r', '6753', '5753', '7367', 'y', '6591', '8099', 'q', '2859', 't', 'z', '9591', '7761', '4191', '3707', '8701', '6893', '8461', '2879', 'u', 'Y', 'Q', '4649', 'A', '9293', '2453', 'I', 'P', '7209', '5379']

SOLUTION:
25, 11, 1847, 7437, 3, 4, 787, 14, 2499, 6029, 18, 6753, 5753, 7367, 25, 6591, 8099, 17, 2859, 20, 26, 9591, 7761, 4191, 3707, 8701, 6893, 8461, 2879, 21, 25, 17, 4649, 1, 9293, 2453, 9, 16, 7209, 5379