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: ['7643', '4967', 'Z', '6797', 'N', 'q', '7941', '1643', 'V', 'u', '1731', 'g', '8245', '227', 'Y', 'B', 'J', '27', '2639', 'i', '5839', 'a', 'p', '3411', 'I']

7643, 4967, 26, 6797, 14, 17, 7941, 1643, 22, 21, 1731, 7, 8245, 227, 25, 2, 10, 27, 2639, 9, 5839, 1, 16, 3411, 9