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: ['9609', '5933', '4167', '9525', '4683', 'o', 'U', 'R', '8887', '51', 'u', 'l', '8883', '2003', '9847']

9609, 5933, 4167, 9525, 4683, 15, 21, 18, 8887, 51, 21, 12, 8883, 2003, 9847