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: ['8899', '3331', 'm', '7011', 'G', 'T', 'A', '9561', 'T', 'O', '6553', 'U', 'R', 'g', 'p', '5133', 'l', 'Z', 'i']

8899, 3331, 13, 7011, 7, 20, 1, 9561, 20, 15, 6553, 21, 18, 7, 16, 5133, 12, 26, 9