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: ['5481', 'U', 'I', 'U', '4503', 'Q', 'w', '8093', '5811', '4253', '5949', 'v', 'H', '7459', '4937', '8157', '2725', 'R', 'O', 't', '1451', '7629', 'u', 'C', 'p', '7343', '2741', '3635', '5327']

5481, 21, 9, 21, 4503, 17, 23, 8093, 5811, 4253, 5949, 22, 8, 7459, 4937, 8157, 2725, 18, 15, 20, 1451, 7629, 21, 3, 16, 7343, 2741, 3635, 5327