You are given a code:

def main_solution(x):
    return (('ezyz' + 'ybshl') + func_4('ahhvuo'))

Can you predict the output of `main_solution("wfhv")` 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": "wfhv"}, "ref_output": "ezyzybshlahhvuo", "ref_code": "def main_solution(x):\n    return (('ezyz' + 'ybshl') + func_4('ahhvuo'))", "funcname": "main_solution"}
rule