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: ['E', '4923', '1817', 'C', '4269', '5399', '9113', 'u', 'H', '6013', 'I', 'Q', 'D', 'G', '611', 'M', '8945', 'g', 'y', '4691', '6419', '1737', '3781', 'b', '8539']

5, 4923, 1817, 3, 4269, 5399, 9113, 21, 8, 6013, 9, 17, 4, 7, 611, 13, 8945, 7, 25, 4691, 6419, 1737, 3781, 2, 8539