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: ['3409', '7305', '6635', '9937', 'k']

3409, 7305, 6635, 9937, 11