You are given a code:

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

Can you predict the output of `main_solution("tcszib")` 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": "tcszib"}, "ref_output": "t\u00abcos\u00bbz\u00abidb\u00bbt\u00abcgs\u00bbz\u00abixb\u00bbt\u00abcds\u00bbzibtcszib", "ref_code": "def main_solution(x):\n    return func_20(func_1(x, 4), func_15('odgxd'))", "funcname": "main_solution"}
rule