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: ['4451', 'L', 'P', '2133', 'k', 'U', '8733', '4589', 'g', 'o', 'o', '297', '3019', '2833', '8923', 'O', 'G']

4451, 12, 16, 2133, 11, 21, 8733, 4589, 7, 15, 15, 297, 3019, 2833, 8923, 15, 7