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: ['2803', '8285', 'U', 'O', '9329', '695', '3877', '1873', '2365', 'P', '153', 'D', '8495', '7593', '4067', 'Y', 'u', '4885', 'f', 'B', 'o', '8499']

SOLUTION: 2803, 8285, 21, 15, 9329, 695, 3877, 1873, 2365, 16, 153, 4, 8495, 7593, 4067, 25, 21, 4885, 6, 2, 15, 8499

PROBLEM: ['s', 't', 'B', '9613', 'G', 'Z', '9193', 'Z', 'X']

SOLUTION: 19, 20, 2, 9613, 7, 26, 9193, 26, 24

PROBLEM: ['F', 't', '7155', '3521', 'Q', 'I', 'E', 'B', 'U', '9743', '5921', '7733', 'V', '3439', '4357', 'r', '1181', 'y', 'a']

SOLUTION:
6, 20, 7155, 3521, 17, 9, 5, 2, 21, 9743, 5921, 7733, 22, 3439, 4357, 18, 1181, 25, 1