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: ['8121', '5707', 'e', '6417', '4535', 'S', 'q', 'z', '3789', '4143', 'I', '5159', 'I', 'v', '9841', '8301', 'X']

8121, 5707, 5, 6417, 4535, 19, 17, 26, 3789, 4143, 9, 5159, 9, 22, 9841, 8301, 24