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: ['L', 'm', '7067', '6191', 'N', 'M', 's']

12, 13, 7067, 6191, 14, 13, 19