You are given a code:

def main_solution(x):
    return func_20('ygevzh', x)

Can you predict the output of `main_solution("vynibsdt")` 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": "vynibsdt"}, "ref_output": "yvgyenvizbhsdt", "ref_code": "def main_solution(x):\n    return func_20('ygevzh', x)", "funcname": "main_solution"}
rule