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: ['7263', '185', '6567', 'J', 'F', '9755', 'B', 'P', 'F', 't', '763', '6527', '55', 'l', '2783', 'n', '6729', 'X', 'B', '8209', 'O', 'G', '3513', '2761', '8123', 'E', 'D', '4403', 'k', 'S', '1429', '9543']

7263, 185, 6567, 10, 6, 9755, 2, 16, 6, 20, 763, 6527, 55, 12, 2783, 14, 6729, 24, 2, 8209, 15, 7, 3513, 2761, 8123, 5, 4, 4403, 11, 19, 1429, 9543