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: ['2525', 'r', '9999', 'k', 'U', 'G', '8269', '8191', '9591', 'l', 'x', 'P', 'm', 'n', '2099', 'y', '2303', '9317', 'p', 'f', 'M', 'X', 'I', 'J', 'O', '8505', 'c', 'v', 'W', '4497', 'l', '6051', '9925', '6391', '5665', 'u', '2777']

2525, 18, 9999, 11, 21, 7, 8269, 8191, 9591, 12, 24, 16, 13, 14, 2099, 25, 2303, 9317, 16, 6, 13, 24, 9, 10, 15, 8505, 3, 22, 23, 4497, 12, 6051, 9925, 6391, 5665, 21, 2777