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: ['7757', '9189', 'P', 'g', 'j', '5813', 'n', 'G', '7807']

7757, 9189, 16, 7, 10, 5813, 14, 7, 7807