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: ['8313', '787', '6427', 'Y', '5525', '8335', 'c', 'e', '3861', '5957', '2011', '347', 'J', 'P', '917', '4607', '5815', '8529', '8719']

8313, 787, 6427, 25, 5525, 8335, 3, 5, 3861, 5957, 2011, 347, 10, 16, 917, 4607, 5815, 8529, 8719