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: ['y', '6185', 'G', 's', '3767', 't', 'L', '1343', '531', 'y', 'Z', 'I', 't', '1669', '1643', 'A']

25, 6185, 7, 19, 3767, 20, 12, 1343, 531, 25, 26, 9, 20, 1669, 1643, 1