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: ['f', '23', '1817', '9789', '6215', '2205', 'w', '1085', 'G', 'w', 'F', '1581']

6, 23, 1817, 9789, 6215, 2205, 23, 1085, 7, 23, 6, 1581