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: ['4785', '3965', 'f', '1365', 'Q', '8561', 'K', 'x', '487', 'u', 'P', '4955', '793', '1243', 'f', 'W', '7757', '6567', 'J', 'm']

4785, 3965, 6, 1365, 17, 8561, 11, 24, 487, 21, 16, 4955, 793, 1243, 6, 23, 7757, 6567, 10, 13