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: ['s', 'P', '7633', 't', 'c', '8499', '5189', 'm', 'N', '1845', '2275', '4991', 'a', '2339', '2643', '3617', '5947', '6577']

19, 16, 7633, 20, 3, 8499, 5189, 13, 14, 1845, 2275, 4991, 1, 2339, 2643, 3617, 5947, 6577