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: ['u', '4633', '4701', '8671', 'a', '9469', 'D', '3411', '87', 'b', '2115', 't', 'd', 'e', 'r', 't', 'w']

21, 4633, 4701, 8671, 1, 9469, 4, 3411, 87, 2, 2115, 20, 4, 5, 18, 20, 23