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: ['7787', '6815', '9', '9581', 'J', 'e', '6437', 'L', 'U', 'G', 'V', 'n', '6155', '9519', 'v', '43', 'G', '6947', 'a', 'q', 'b', 'H', 'X', '5433', 't', 'r', 'G', 'Q', '3917', '549', '3605', 'g', '2199', 'Z', '4167', 'v']

7787, 6815, 9, 9581, 10, 5, 6437, 12, 21, 7, 22, 14, 6155, 9519, 22, 43, 7, 6947, 1, 17, 2, 8, 24, 5433, 20, 18, 7, 17, 3917, 549, 3605, 7, 2199, 26, 4167, 22