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: ['6543', '43', '2425', '6217', 'a', '2545', '1433', 'b', '3283', 'b', 's', '7311', '823', '3461', '2451', '8649', 'N', 'j', '1771', '4289', 'N', '1299', '3943', '3347', '2507', 'v', '5871', '1671', 'P', 'D', '2139', 'L', 'Q', '1365', 'L', 'O', 'y', 'K']

6543, 43, 2425, 6217, 1, 2545, 1433, 2, 3283, 2, 19, 7311, 823, 3461, 2451, 8649, 14, 10, 1771, 4289, 14, 1299, 3943, 3347, 2507, 22, 5871, 1671, 16, 4, 2139, 12, 17, 1365, 12, 15, 25, 11