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: ['x', '8173', 'b', '3513', 'C', 'e', 'F', '1791', '3407', 'E', '5945', 'l']

24, 8173, 2, 3513, 3, 5, 6, 1791, 3407, 5, 5945, 12