You are given a code:

def main_solution(x):
    return func_5('rmb', 'ukq')

Can you predict the output of `main_solution("fptvysu")` 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": "fptvysu"}, "ref_output": "ukqrmb", "ref_code": "def main_solution(x):\n    return func_5('rmb', 'ukq')", "funcname": "main_solution"}
rule