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: ['d', 'G', 'e', 'G', 'N', 'u', 'u', '9433', '4851', '5197', 'b', '5467', '5473']

4, 7, 5, 7, 14, 21, 21, 9433, 4851, 5197, 2, 5467, 5473