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: ['9217', 'f', '9107', '1393', 'I', '2491', '3309', 'E', 't', '8889', '9161', '6943', '853', '2275', 'e', 'c', 'R', 'T', 'B']

9217, 6, 9107, 1393, 9, 2491, 3309, 5, 20, 8889, 9161, 6943, 853, 2275, 5, 3, 18, 20, 2