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: ['8711', 'e', '5951', 'Y', 'S', 'V', '2141', 'g', 'R', '627', '8803', 'q', '9501', '1999', 'S', '2115', 'P', '7185', 'r', 'c', 'E', 'J', '2721', 'a', 'd', '6801', '7393', '2427', '4311', 't', 'r', 'h', '3429']

8711, 5, 5951, 25, 19, 22, 2141, 7, 18, 627, 8803, 17, 9501, 1999, 19, 2115, 16, 7185, 18, 3, 5, 10, 2721, 1, 4, 6801, 7393, 2427, 4311, 20, 18, 8, 3429