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: ['O', 'A', 'G', '3589', 'G', 'T', '8469', 'L', '1771', '5405', '5829', 'c', 'b', '7811', 'A', '7775', 'c', '9585', 'P', 'X', '2709', 'z', 'A', '4037', '8773', 'F', 'I', 'y', 'R']

15, 1, 7, 3589, 7, 20, 8469, 12, 1771, 5405, 5829, 3, 2, 7811, 1, 7775, 3, 9585, 16, 24, 2709, 26, 1, 4037, 8773, 6, 9, 25, 18