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: ['T', 'x', '3537', '8045', 'q', '3651', 'h', '6449', '6281', '51', '6643', '6439', 'w', 'X', 'G', 'N', 'm', 'I']

20, 24, 3537, 8045, 17, 3651, 8, 6449, 6281, 51, 6643, 6439, 23, 24, 7, 14, 13, 9