You are given a code:

def main_solution(x):
    return func_5(func_20('vxico', 'tttft'), 'fny')

Can you predict the output of `main_solution("gfjogvsc")` 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": "gfjogvsc"}, "ref_output": "fnyvtxtitcfot", "ref_code": "def main_solution(x):\n    return func_5(func_20('vxico', 'tttft'), 'fny')", "funcname": "main_solution"}
rule