You are given a code:

def main_solution(x):
    return (func_20('mgcrr', x) + func_13('lytbpi', '-'))

Can you predict the output of `main_solution("qsbnbuaf")` 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": "qsbnbuaf"}, "ref_output": "mqgscbrnrbuafl-y-t-b-p-i", "ref_code": "def main_solution(x):\n    return (func_20('mgcrr', x) + func_13('lytbpi', '-'))", "funcname": "main_solution"}
rule