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: ['G', 'B', '9105', '5401', '757', 'h', '5187', '8831']

7, 2, 9105, 5401, 757, 8, 5187, 8831