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: ['1207', 'B', '4273', '7081', '6009', '3933', '5589', '1543', '2631']

1207, 2, 4273, 7081, 6009, 3933, 5589, 1543, 2631