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: ['6865', '2731', 'G', 'T', 'M', 'b', 'j']

6865, 2731, 7, 20, 13, 2, 10