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: ['N', 'f', '8347', '7807', '6019', '9973']

SOLUTION: 14, 6, 8347, 7807, 6019, 9973

PROBLEM: ['a', '4715', 'X', '4649', '6995']

SOLUTION: 1, 4715, 24, 4649, 6995

PROBLEM: ['2905', 'x', 'i', 'c', '5873', 'h', '3485', 'd', 'C', 'z', '9265', 'Y', '4081', 'O']

SOLUTION:
2905, 24, 9, 3, 5873, 8, 3485, 4, 3, 26, 9265, 25, 4081, 15