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: ['M', 'z', '4869', 'c', 'Q', '8473', '4145', 'V', '8803', '697', 'n', 'D', 'A', 'o', '7215', '3127', '4541', 'I', '8139', '2329', '9265']

13, 26, 4869, 3, 17, 8473, 4145, 22, 8803, 697, 14, 4, 1, 15, 7215, 3127, 4541, 9, 8139, 2329, 9265