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', 'N', 'Q', '2437', 'O', '6015', 'm', 'j', '5577', '2751', '7151', 'q', '5887', '9189', 'r', '1903', 'n', 'I', 'q', '4727']

20, 14, 17, 2437, 15, 6015, 13, 10, 5577, 2751, 7151, 17, 5887, 9189, 18, 1903, 14, 9, 17, 4727