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: ['D', '7137', 'S', 'U', '1793', '9401', 'u', 'B', 'c', 'Z', 'H', 'T', '6861', '4549', '1023', 'y', '1321', '8109', 'y', 'r', 'x', '7581', 'l', '2119', 'w', '9207', '871', 'h', '3327', 'e', '2829', 'n', '4335', 'S', '7923', '8105']

4, 7137, 19, 21, 1793, 9401, 21, 2, 3, 26, 8, 20, 6861, 4549, 1023, 25, 1321, 8109, 25, 18, 24, 7581, 12, 2119, 23, 9207, 871, 8, 3327, 5, 2829, 14, 4335, 19, 7923, 8105