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: ['k', '4389', '1081', 'n', '9073', 'H', 'I', 'D', '1257', 'l']

11, 4389, 1081, 14, 9073, 8, 9, 4, 1257, 12