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: ['2407', 'A', 'f', '7167', '629', 'L', 'u', '6675', 'C', '857', 'A', '2385', 'G']

2407, 1, 6, 7167, 629, 12, 21, 6675, 3, 857, 1, 2385, 7