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: ['6741', 'o', 't', 'E', 'K', 's', 'i', 's', '2011']

6741, 15, 20, 5, 11, 19, 9, 19, 2011