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: ['s', 't', 'B', '9613', 'G', 'Z', '9193', 'Z', 'X']

19, 20, 2, 9613, 7, 26, 9193, 26, 24