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: ['203', 'n', 'i', 'h', '7915', '5887', '1439', '9851', 'r', 'T', '6809', '9697', '8733', 'r', '5045']

203, 14, 9, 8, 7915, 5887, 1439, 9851, 18, 20, 6809, 9697, 8733, 18, 5045