Please provide the Python code and the resulting output.

Question - Given a dict that maps a class number to a major identifiers where you could find that class number, return the set of numbers that one could take for a specific major!

- For an extra challenge, try doing this in one line (Optional).

Args: adict (dict) major (str) Returns: set

>>> classes_dict = {4232: ["ISYE", "MATH", "HTS"], 2316: ["CS", "CX", "MGT"], 3000: ["ISYE", "MGT", "ECE"], 2027: ["ISYE", "PSYC", "HTS"]}

>>> classes(classes_dict, "ISYE") {4232, 2027, 3000}

>>> classes(classes_dict, "CS") {2316}