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: ['2789', '7795', 'b', 'I', 'A', '1921', 'K', 'm', 'D', 'J', '8865', '559', 'a', '7693', 'h', 'y', '7171', 'L', 'o', '7377', '9751', '963']

2789, 7795, 2, 9, 1, 1921, 11, 13, 4, 10, 8865, 559, 1, 7693, 8, 25, 7171, 12, 15, 7377, 9751, 963