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: ['4867', 'E', 'K', '849', 'O', 'A', '6117', '8649', 'i']

4867, 5, 11, 849, 15, 1, 6117, 8649, 9