You are given a code:

def main_solution(x):
    return func_20('nbkgy', 'jcbslp')

Can you predict the output of `main_solution("hhslybfozn")` 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": "hhslybfozn"}, "ref_output": "njbckbgsylp", "ref_code": "def main_solution(x):\n    return func_20('nbkgy', 'jcbslp')", "funcname": "main_solution"}
rule