You are given a code:

def main_solution(x):
    return func_9(('ppuqsu' + 'lgz'))

Can you predict the output of `main_solution("rgisdl")` 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": "rgisdl"}, "ref_output": "ppuqsulgzzglusqupp", "ref_code": "def main_solution(x):\n    return func_9(('ppuqsu' + 'lgz'))", "funcname": "main_solution"}
rule