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: ['I', 'M', '7715', 'T', 'b', 'j', 'k', 'Z', 'R', '8331', '9469', 'Q', '2773']

9, 13, 7715, 20, 2, 10, 11, 26, 18, 8331, 9469, 17, 2773