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: ['P', 'Z', '1029', '9551', 'z', '1313', 'h', '5641', 'N', 'I']

16, 26, 1029, 9551, 26, 1313, 8, 5641, 14, 9