You are given a code:

def main_solution(x):
    return ('ndgrq' + 'ttitm')

Can you predict the output of `main_solution("qefplemur")` 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": "qefplemur"}, "ref_output": "ndgrqttitm", "ref_code": "def main_solution(x):\n    return ('ndgrq' + 'ttitm')", "funcname": "main_solution"}
rule