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: ['8567', 'D', '9841', 'H', 't', 'x', '9397']

8567, 4, 9841, 8, 20, 24, 9397