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: ['U', 'K', '6027', 'i', '8421', 't', 'e', 'V', '3075', '7015', '6087', 'I', '9333', '6167', '1259', 'd', 't', 'n', '9227', 'P', '4467']

21, 11, 6027, 9, 8421, 20, 5, 22, 3075, 7015, 6087, 9, 9333, 6167, 1259, 4, 20, 14, 9227, 16, 4467