You are given a code:

def main_solution(x):
    return func_20('fjlz', 'rpje')

Can you predict the output of `main_solution("oynl")` 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": "oynl"}, "ref_output": "frjpljze", "ref_code": "def main_solution(x):\n    return func_20('fjlz', 'rpje')", "funcname": "main_solution"}
rule