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: ['A', '5325', 'K', 'l', '9581', '9107', 'u', 'G', '3819', 'B', 'G', '683', '5541']

1, 5325, 11, 12, 9581, 9107, 21, 7, 3819, 2, 7, 683, 5541