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: ['6867', '2393', '4203', '4409', 'N', 'b', 'q', 'Z', 'a', '5487', '7011', '9771']

6867, 2393, 4203, 4409, 14, 2, 17, 26, 1, 5487, 7011, 9771