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: ['8543', 'Y', '6643', 'R', 'D', '3761', 'x', 'w', 'N', 'I']

8543, 25, 6643, 18, 4, 3761, 24, 23, 14, 9