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: ['4795', 'O', '8901', 'h', '757', 'b', 'U', '2385', '7085', 'b', '1571', 'B', 'o', 'B', 'R', '3445', '1139', 'n', '9465', '3587']

4795, 15, 8901, 8, 757, 2, 21, 2385, 7085, 2, 1571, 2, 15, 2, 18, 3445, 1139, 14, 9465, 3587