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: ['2855', '7551', 'a', 'q', '7435', 'E', 'F', 'A', 'D', 'Z', '2109', '5987', '4767', 'Q', '345', '6185', '3541', 'J', 'w', '3631', '9985', 'w', 'u']

2855, 7551, 1, 17, 7435, 5, 6, 1, 4, 26, 2109, 5987, 4767, 17, 345, 6185, 3541, 10, 23, 3631, 9985, 23, 21