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: ['4685', '5269', 'b', 'x', '5911', 'Y', 'L', '5537', '4185', '3335', '247', '5407', 's', '2429', 'V', 'S', 'i', 'o', '53', 'r', '861', 'R', '3257', '7095', '2295', 'J', 'd', 'c', '3547', 'L', '2939', '7543', '5609', 'a']

4685, 5269, 2, 24, 5911, 25, 12, 5537, 4185, 3335, 247, 5407, 19, 2429, 22, 19, 9, 15, 53, 18, 861, 18, 3257, 7095, 2295, 10, 4, 3, 3547, 12, 2939, 7543, 5609, 1