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: ['P', 'D', '2549', 'S', '781', 'L', '2277', 'I', '4115', 'w', 'l', 'e', '1129', 'O', 'U', 'd', 'j', 'D', 'B', '4079', '1299', '7339', '1169', 'a', 'n', 'C', 'O', '5057', 't', 'b', 'q', 'C', '5541']

16, 4, 2549, 19, 781, 12, 2277, 9, 4115, 23, 12, 5, 1129, 15, 21, 4, 10, 4, 2, 4079, 1299, 7339, 1169, 1, 14, 3, 15, 5057, 20, 2, 17, 3, 5541