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: ['2587', '2109', 'w', 'a', 'a', '8163', 'G', '8855']

2587, 2109, 23, 1, 1, 8163, 7, 8855