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: ['U', '2801', '8039', '2795', 'J', 'l', 'n', 'B', '5693', '9151']

21, 2801, 8039, 2795, 10, 12, 14, 2, 5693, 9151