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: ['485', '4111', 'i', '8921', '3299', 'E', 'C', '7911', '4433', 'I', 'R', '2705']

485, 4111, 9, 8921, 3299, 5, 3, 7911, 4433, 9, 18, 2705