You are given a code:

def main_solution(x):
    return func_5('yookf', 'shmq')

Can you predict the output of `main_solution("fva")` 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": "fva"}, "ref_output": "shmqyookf", "ref_code": "def main_solution(x):\n    return func_5('yookf', 'shmq')", "funcname": "main_solution"}
rule