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: ['B', 'K', '7845', '8243', '3641', '7491', '9695', 'L', 'B', 'P', 'e', 'Q', 'A', '4353', 'Q', '3211', '557', '6479', 'e', '4187']

2, 11, 7845, 8243, 3641, 7491, 9695, 12, 2, 16, 5, 17, 1, 4353, 17, 3211, 557, 6479, 5, 4187