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: ['E', 'X', '5683', 'P', '3623', '5137']

5, 24, 5683, 16, 3623, 5137