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: ['2409', '3323', '53', 'C', 'k', 'I', '3099', 'Y', 'i', 'G', 'h', 'O', 'Z', 'r', '6417', '1477', 'x', '1973', 'l', 's', 'b', '9475', '543', '4929', '7793', '1231']

2409, 3323, 53, 3, 11, 9, 3099, 25, 9, 7, 8, 15, 26, 18, 6417, 1477, 24, 1973, 12, 19, 2, 9475, 543, 4929, 7793, 1231