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', 'h', 'O', 'j', 'f', 'Q', 'o', 's', 'r', '5617', '6939']

19, 8, 15, 10, 6, 17, 15, 19, 18, 5617, 6939