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: ['r', '4527', '2561', '7601', 'y', 'N', '9083', 'k', 'z']

18, 4527, 2561, 7601, 25, 14, 9083, 11, 26