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: ['2973', 'a', '6251', 's', '5009', 'm', 'G']

SOLUTION: 2973, 1, 6251, 19, 5009, 13, 7

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

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

PROBLEM: ['2693', 'q', '1077', 'V', '4429', 'Y', '29', '3395', 'e', '5979', 'K', '3225', '4173']

SOLUTION:
2693, 17, 1077, 22, 4429, 25, 29, 3395, 5, 5979, 11, 3225, 4173