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: ['8343', 'I', '821', '6739', '5089', 'o', '7967', '1591', '3113']

8343, 9, 821, 6739, 5089, 15, 7967, 1591, 3113