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: ['m', 'O', '9283', 'x', '2551', 'e', 'T', 'v', 'e', '2761', '2777', 'i', '4915', '427', '6203', '1857', '3439', 'W', 'H', 'n', 'g', '7703', 'N', '5703', 'D', '9125', '3405', 'P', '6731', '4221', 'z', '1035', 'r', 't', 'S', '7677', 'i', '647', '173']

13, 15, 9283, 24, 2551, 5, 20, 22, 5, 2761, 2777, 9, 4915, 427, 6203, 1857, 3439, 23, 8, 14, 7, 7703, 14, 5703, 4, 9125, 3405, 16, 6731, 4221, 26, 1035, 18, 20, 19, 7677, 9, 647, 173