You are given a code:

def main_solution(x):
    return ('ydpuqo' + 'rietwj')

Can you predict the output of `main_solution("oozxjjn")` 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": "oozxjjn"}, "ref_output": "ydpuqorietwj", "ref_code": "def main_solution(x):\n    return ('ydpuqo' + 'rietwj')", "funcname": "main_solution"}
rule