You are given a code:

def main_solution(x):
    return func_4(func_5('ozqxt', 'krt'))

Can you predict the output of `main_solution("tvqj")` 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": "tvqj"}, "ref_output": "krtozqxt", "ref_code": "def main_solution(x):\n    return func_4(func_5('ozqxt', 'krt'))", "funcname": "main_solution"}
rule