You are given a code:

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

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