You are given a code:

def main_solution(x):
    return func_5('fwgt', 'ypsu')

Can you predict the output of `main_solution("ftw")` 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": "ftw"}, "ref_output": "ypsufwgt", "ref_code": "def main_solution(x):\n    return func_5('fwgt', 'ypsu')", "funcname": "main_solution"}
rule