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: ['6007', '1319', '5325', '1013', '2677', 'E', '707', '8137', 'n', 'g', '3547', '9733', '4457', 'd', '2805', 'D', '125', '8437', '7479', 'N', 'D', 'M', 'y', 'Y', '849', '6117', 'Q', 'y', '6471', '9383', '6641', 'W', '2691']

6007, 1319, 5325, 1013, 2677, 5, 707, 8137, 14, 7, 3547, 9733, 4457, 4, 2805, 4, 125, 8437, 7479, 14, 4, 13, 25, 25, 849, 6117, 17, 25, 6471, 9383, 6641, 23, 2691