You are given a code:

def main_solution(x):
    return func_17(func_13('tuxbo', '-'))

Can you predict the output of `main_solution("xblvbruc")` 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": "xblvbruc"}, "ref_output": "o-b-x-u-t", "ref_code": "def main_solution(x):\n    return func_17(func_13('tuxbo', '-'))", "funcname": "main_solution"}
rule