You are given a code:

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

Can you predict the output of `main_solution("tlfynjepy")` 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": "tlfynjepy"}, "ref_output": "\u00abstw\u00bbz\u00abwlv\u00bbt\u00ablff\u00bby\u00abnyj\u00bbe\u00abpny\u00bb\u00abj\u00bb\u00abe\u00bb\u00abp\u00bb\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), ('swzwv' + x))", "funcname": "main_solution"}
rule