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: ['8407', '4207', '1095', 'S', 'n', 'z', '2909', '9457', 'G', 'k', 'E', 'k', 'p', 'a', 'q', '1327', '5943']

8407, 4207, 1095, 19, 14, 26, 2909, 9457, 7, 11, 5, 11, 16, 1, 17, 1327, 5943