You are given a code:

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

Can you predict the output of `main_solution("owybte")` 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": "owybte"}, "ref_output": "t\u00absoi\u00bbl\u00abtws\u00bbi\u00ablyt\u00bbs\u00abibl\u00bbt\u00absti\u00bbl\u00abe\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_1('tsil', 4), func_15(x))", "funcname": "main_solution"}
rule