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: ['7561', '3117', 'r', '613', 'W', '2509', 'c', 'x', '5997', '5669', 'j', '7805', 'C', '4625', 'u', 'E', '6745', 'I']

7561, 3117, 18, 613, 23, 2509, 3, 24, 5997, 5669, 10, 7805, 3, 4625, 21, 5, 6745, 9