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', '8741', 'a', '3791', '6187', 'r', 'V', 'D', '2931', 'I', 'D', '3879', '3779', '5291', 'B', 'K', '7477', 'j', '6321', 'b', 'U', 'J', 'Y', '1237', '1155', '479', '4349', '2985', 'g', '97', '2217', '8113', '8891', 'M', 'X']

4, 8741, 1, 3791, 6187, 18, 22, 4, 2931, 9, 4, 3879, 3779, 5291, 2, 11, 7477, 10, 6321, 2, 21, 10, 25, 1237, 1155, 479, 4349, 2985, 7, 97, 2217, 8113, 8891, 13, 24