You are given a code:

def main_solution(x):
    return func_20('twwatx', 'feoq')

Can you predict the output of `main_solution("zzlvykpec")` 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": "zzlvykpec"}, "ref_output": "tfwewoaqtx", "ref_code": "def main_solution(x):\n    return func_20('twwatx', 'feoq')", "funcname": "main_solution"}
rule