You are given a code:

def main_solution(x):
    return func_20(func_15('kotl'), ('ytfvn' + x))

Can you predict the output of `main_solution("jwhxujbrw")` without writing any code? Please reason and put your final answer in the following json format: {"output": <your output>}, where <your output> should be the final string.
user
{"ref_input": {"x": "jwhxujbrw"}, "ref_output": "\u00abykt\u00bbf\u00abvon\u00bbj\u00abwth\u00bbx\u00abulj\u00bbbrw", "ref_code": "def main_solution(x):\n    return func_20(func_15('kotl'), ('ytfvn' + x))", "funcname": "main_solution"}
rule