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: ['M', 'W', '81', 'G', '3015', 'i', '7019', 'n', 'Q', '9433', '1581', 'd', 'U', '8775', 'x', 'I', 'H', '2261', '2667', '6227', '1047', '6503', 'k', 'L', '7373', '1275', '429', '9743', '5921', 'k', '951', 'N']

13, 23, 81, 7, 3015, 9, 7019, 14, 17, 9433, 1581, 4, 21, 8775, 24, 9, 8, 2261, 2667, 6227, 1047, 6503, 11, 12, 7373, 1275, 429, 9743, 5921, 11, 951, 14