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: ['6025', '8927', 'D', 'I', 'J', '3503', 'u', '4675', 'O', '3953']

6025, 8927, 4, 9, 10, 3503, 21, 4675, 15, 3953