You are given a code:

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

Can you predict the output of `main_solution("mhgvoqttsh")` 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": "mhgvoqttsh"}, "ref_output": "\u00absr-\u00bbk\u00ab-mg\u00bb-\u00abxa-\u00bbd", "ref_code": "def main_solution(x):\n    return func_20(func_15('rma'), func_13('skgxd', '-'))", "funcname": "main_solution"}
rule