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: ['8203', 'q', 'c', '7841', 'S', '6479', 'o', '4721']

8203, 17, 3, 7841, 19, 6479, 15, 4721