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: ['f', '6773', 'G', 'b', '5379', '7367', '8349', 'T', 'x', 'o', 'V', 'J', 'Y', '5533', '8207']

6, 6773, 7, 2, 5379, 7367, 8349, 20, 24, 15, 22, 10, 25, 5533, 8207