You are given a code:

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

Can you predict the output of `main_solution("gcybsow")` 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": "gcybsow"}, "ref_output": "g\u00abcty\u00bbb\u00abswo\u00bbw\u00abgnc\u00bby\u00abbjs\u00bbowgcybsowgcybsow", "ref_code": "def main_solution(x):\n    return func_20(func_1(x, 4), func_15('twnj'))", "funcname": "main_solution"}
rule