You are given a code:

def main_solution(x):
    return func_20(func_13('lvnt', '-'), func_15(x))

Can you predict the output of `main_solution("fojvzubzdc")` 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": "fojvzubzdc"}, "ref_output": "l\u00ab-fv\u00bb-\u00abno-\u00bbt\u00abj\u00bb\u00abv\u00bb\u00abz\u00bb\u00abu\u00bb\u00abb\u00bb\u00abz\u00bb\u00abd\u00bb\u00abc\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_13('lvnt', '-'), func_15(x))", "funcname": "main_solution"}
rule