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: ['7451', 'Y', 'p', 'Y', '7717', 'A', '5827', '9889', 'B', '1143', '2401', 's', 'N', 'C', 'G', 'Z', 'C', 'r', '8281', 'C', '5365', 'N', '8081', '987', '1615', '3935']

7451, 25, 16, 25, 7717, 1, 5827, 9889, 2, 1143, 2401, 19, 14, 3, 7, 26, 3, 18, 8281, 3, 5365, 14, 8081, 987, 1615, 3935