You are given a code:

def main_solution(x):
    return func_20('roz', 'vvfo')

Can you predict the output of `main_solution("vqszuijp")` 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": "vqszuijp"}, "ref_output": "rvovzfo", "ref_code": "def main_solution(x):\n    return func_20('roz', 'vvfo')", "funcname": "main_solution"}
rule