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: ['n', 'x', 'Y', 't', '4343', '6821', 'b', '9845', '9675', 't', '7807', 'J', 't', 'N', '5261']

14, 24, 25, 20, 4343, 6821, 2, 9845, 9675, 20, 7807, 10, 20, 14, 5261