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: ['4701', 'u', 'e', 'U', 'S', '9925', '9671']

4701, 21, 5, 21, 19, 9925, 9671