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: ['D', '9511', '9533', '5641', 'h', 'e', 'b', 'Q', 'Z', 'T']

4, 9511, 9533, 5641, 8, 5, 2, 17, 26, 20