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: ['m', 'c', 'F', '7937', '6673', '3777', '1815', 'R', '1709']

13, 3, 6, 7937, 6673, 3777, 1815, 18, 1709