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: ['9449', 'O', '2801', 'R', 's', 'O', '7527', 'o', '2377', 'I', 'U', '1589', 'g', '8409', 'l', 'O', 'A', '1325', '3411']

9449, 15, 2801, 18, 19, 15, 7527, 15, 2377, 9, 21, 1589, 7, 8409, 12, 15, 1, 1325, 3411