You are given a code:

def main_solution(x):
    return func_20(func_15('tezr'), func_20('ovccw', 'svlfc'))

Can you predict the output of `main_solution("wtqarufvw")` 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": "wtqarufvw"}, "ref_output": "\u00abots\u00bbv\u00abvec\u00bbl\u00abczf\u00bbw\u00abcr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('tezr'), func_20('ovccw', 'svlfc'))", "funcname": "main_solution"}
rule