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: ['6109', 'R', 'x', 'u', '2349', 'a', '9521', '9321', '5557', 'D', 's', 'T', '27', '757', '4791', 'Q', '2861', '5863', '8187', 'J', 'e', '9323', 'E', '3207', 'm', '4577', 'B', 'O', 's', 'a', 'B']

6109, 18, 24, 21, 2349, 1, 9521, 9321, 5557, 4, 19, 20, 27, 757, 4791, 17, 2861, 5863, 8187, 10, 5, 9323, 5, 3207, 13, 4577, 2, 15, 19, 1, 2