You are given a code:

def main_solution(x):
    return func_20(func_13('htgtmv', '-'), func_22('divnni'))

Can you predict the output of `main_solution("tbthrw")` 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": "tbthrw"}, "ref_output": "hd-itv-ngn-it-m-v", "ref_code": "def main_solution(x):\n    return func_20(func_13('htgtmv', '-'), func_22('divnni'))", "funcname": "main_solution"}
rule