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: ['Q', '2971', '5709', '4005', '4209', 'A', '159', '4273']

17, 2971, 5709, 4005, 4209, 1, 159, 4273