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: ['U', '9707', '5367', '533', 'C', 'g', '5039', '4489', '8129', '5419', 'w', 'P', '4025', '641', 'B', '7423', 'e', 'Q', '4235', '9235', 'y', 'r']

SOLUTION: 21, 9707, 5367, 533, 3, 7, 5039, 4489, 8129, 5419, 23, 16, 4025, 641, 2, 7423, 5, 17, 4235, 9235, 25, 18

PROBLEM: ['o', '105', '2539', 'I', 'X']

SOLUTION: 15, 105, 2539, 9, 24

PROBLEM: ['333', 'u', 'x', 'r', '2191', '6127', 'T', '7095', 'H', '7617', 's', '6597', 't', '1335', 'm', '9819']

SOLUTION:
333, 21, 24, 18, 2191, 6127, 20, 7095, 8, 7617, 19, 6597, 20, 1335, 13, 9819