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: ['9509', 'p', '2267', 'M', 'l', 'k', '951', 'B']

9509, 16, 2267, 13, 12, 11, 951, 2