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: ['6991', '4265', 'e', '3307', '1137', 'j', '677', 'I', 'r', 'q']

6991, 4265, 5, 3307, 1137, 10, 677, 9, 18, 17