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: ['v', '9353', '6801', 'b', '3915', '3949', 'b', 'i', '1287', '4389']

22, 9353, 6801, 2, 3915, 3949, 2, 9, 1287, 4389