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: ['737', 'j', 'v', '6381', 'B', '2081', '5603', '4347', 'D']

737, 10, 22, 6381, 2, 2081, 5603, 4347, 4