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: ['5289', 'I', '7477', '3861', '7561', 'm', 'K']

5289, 9, 7477, 3861, 7561, 13, 11