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: ['1281', '3483', '9435', '4083', 'L', '6187', 'M', 'f']

1281, 3483, 9435, 4083, 12, 6187, 13, 6