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: ['7501', 'c', 'n', '3551', 'U', '8239', 'L', '3149', '9399', 'a', '2763', '2461', 'p']

SOLUTION: 7501, 3, 14, 3551, 21, 8239, 12, 3149, 9399, 1, 2763, 2461, 16

PROBLEM: ['5445', '5961', 'Y', 'E', '8771', '6475', 'P', '5947', '4139']

SOLUTION: 5445, 5961, 25, 5, 8771, 6475, 16, 5947, 4139

PROBLEM: ['G', '9235', 'j', 'Z', 'm', 'I', '929', 'G', '3433', '9891', '2661', 'O', 'g', 'H', '8145', '7445', 'd', 'V', 'x', 't', '1653', '1975', '4889', '4275']

SOLUTION:
7, 9235, 10, 26, 13, 9, 929, 7, 3433, 9891, 2661, 15, 7, 8, 8145, 7445, 4, 22, 24, 20, 1653, 1975, 4889, 4275