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', 'u', 'g', 'V', '1545', 'a', 'O', 'y', 'J', '5727', 'n', '8475', 'l', '5589', 'Z', 'O']

14, 21, 7, 22, 1545, 1, 15, 25, 10, 5727, 14, 8475, 12, 5589, 26, 15