You are given a code:

def main_solution(x):
    return ('sibuus' + 'bzeq')

Can you predict the output of `main_solution("tftmqez")` 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": "tftmqez"}, "ref_output": "sibuusbzeq", "ref_code": "def main_solution(x):\n    return ('sibuus' + 'bzeq')", "funcname": "main_solution"}
rule