You are given a code:

def main_solution(x):
    return func_20(func_15('sfl'), func_1('fvojy', 4))

Can you predict the output of `main_solution("uecqt")` 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": "uecqt"}, "ref_output": "\u00abfsv\u00bbo\u00abjfy\u00bbf\u00abvlo\u00bbjyfvojyfvojy", "ref_code": "def main_solution(x):\n    return func_20(func_15('sfl'), func_1('fvojy', 4))", "funcname": "main_solution"}
rule