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: ['6763', 'l', '3695', '3923', 'N', 'd', 'q', '8307', '9455', '3903', '6725', 'Q', '4377', '1409', '6525', 'I', '9971', '7273', '3173', 'N', '7373', 'F', '6881', '1479', '6251', '5557', 'G', '3463', 'Y', 'X', 'J', '1753', '7827', '4171']

6763, 12, 3695, 3923, 14, 4, 17, 8307, 9455, 3903, 6725, 17, 4377, 1409, 6525, 9, 9971, 7273, 3173, 14, 7373, 6, 6881, 1479, 6251, 5557, 7, 3463, 25, 24, 10, 1753, 7827, 4171