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: ['3815', '6963', '1481', 'i', 'N', 'S', '1029', '3511', 'H', 'M', '2701', '8769', '1927']

3815, 6963, 1481, 9, 14, 19, 1029, 3511, 8, 13, 2701, 8769, 1927