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: ['3071', '4087', '3533', 'R', '9159', '2821', 'Y', '9919', '8425', 't']

3071, 4087, 3533, 18, 9159, 2821, 25, 9919, 8425, 20