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: ['3555', '1757', 'N', '4115', 'X', 'q', '8591', 'Z', '6411', '5379', '2789', '3581', 'f', '1231', 'I', 'E', 'D', 'p', '5967', '7229', 'O', '7435']

3555, 1757, 14, 4115, 24, 17, 8591, 26, 6411, 5379, 2789, 3581, 6, 1231, 9, 5, 4, 16, 5967, 7229, 15, 7435