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: ['9175', '3281', 'k', 'V', 'U', '6435', 'T', '2809']

9175, 3281, 11, 22, 21, 6435, 20, 2809