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: ['S', '6599', 'i', 'u', '7321', '859', '171', '7539', 'u', 'q', 'Y', '5699', '5409', 'C', '2885', '8065', '4941', '5981']

SOLUTION: 19, 6599, 9, 21, 7321, 859, 171, 7539, 21, 17, 25, 5699, 5409, 3, 2885, 8065, 4941, 5981

PROBLEM: ['W', 'A', '7541', 'Q', 'l', '6441', 'L', 'G', 'e', 'y', '8575', 'y', '8627', 'Z', 'j', 'J', '4411', 'n', 'n', 'v', '5675', '9641']

SOLUTION: 23, 1, 7541, 17, 12, 6441, 12, 7, 5, 25, 8575, 25, 8627, 26, 10, 10, 4411, 14, 14, 22, 5675, 9641

PROBLEM: ['C', '4399', '6345', 'q', 'n', '1717', '8375', 'f', 'y', 'L', '3095', '1073', '5715', 'E', 'z', '8515', 'i', 'u', 'D', 'a', '9405', '9853', '7493', 'T', '9277', 's', 'Z']

SOLUTION:
3, 4399, 6345, 17, 14, 1717, 8375, 6, 25, 12, 3095, 1073, 5715, 5, 26, 8515, 9, 21, 4, 1, 9405, 9853, 7493, 20, 9277, 19, 26