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: ['R', '5231', 'A', 'A', '5689', 'N', '8559']

18, 5231, 1, 1, 5689, 14, 8559