You are given a code:

def main_solution(x):
    return func_20(func_15('has'), func_5(x, 'mbte'))

Can you predict the output of `main_solution("ftzuh")` 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": "ftzuh"}, "ref_output": "\u00abmhb\u00bbt\u00abeaf\u00bbt\u00abzsu\u00bbh", "ref_code": "def main_solution(x):\n    return func_20(func_15('has'), func_5(x, 'mbte'))", "funcname": "main_solution"}
rule