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: ['d', 'B', '4555', '4443', '5411', '2005', '3035', 's', '3655', 'y', '9227', 'W', '5457', 'N', 's', '6457', 'D', 'L', 'C']

4, 2, 4555, 4443, 5411, 2005, 3035, 19, 3655, 25, 9227, 23, 5457, 14, 19, 6457, 4, 12, 3