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: ['6847', '5493', 'r', '4613', '9651', '403', '8905', 'c', '1051', 'A', 'j', 'L', '199', '3243', 'i', '1479', '5711', '7017', 'T', 'O', '7371', '9505', '1117']

6847, 5493, 18, 4613, 9651, 403, 8905, 3, 1051, 1, 10, 12, 199, 3243, 9, 1479, 5711, 7017, 20, 15, 7371, 9505, 1117