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: ['4873', 'B', 'o', 'T', '5531', '4391', 't', 'e', 'U', '1249', '3625', 'F', 'L', 'M', 'z', '9299', 'J', 'G', '4709', 's', '7971', 'S', '6265', '9009', '5477', '2591', 'x', 'f', 'w', 'u', 'P', 'V', 'u', 'U', 'V', '8363', '8147']

4873, 2, 15, 20, 5531, 4391, 20, 5, 21, 1249, 3625, 6, 12, 13, 26, 9299, 10, 7, 4709, 19, 7971, 19, 6265, 9009, 5477, 2591, 24, 6, 23, 21, 16, 22, 21, 21, 22, 8363, 8147