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.
Input: ['4995', '8159', 'y', 'b', 'W', '8973', 't', '7399', 'W', 'K', '4875', '4633', '2587', '2509', '2481', '3341', '3449', 'C', 'm', '1789', 'Y', 'K', 'I', 'E', '3415', 'c', '7723', '325', 'B', 'd', 'C', 'Z', '4875', 'x', '2863', 's']

4995, 8159, 25, 2, 23, 8973, 20, 7399, 23, 11, 4875, 4633, 2587, 2509, 2481, 3341, 3449, 3, 13, 1789, 25, 11, 9, 5, 3415, 3, 7723, 325, 2, 4, 3, 26, 4875, 24, 2863, 19