You are given a code:

def main_solution(x):
    return ('yfboww' + x)

Can you predict the output of `main_solution("nnsbc")` 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": "nnsbc"}, "ref_output": "yfbowwnnsbc", "ref_code": "def main_solution(x):\n    return ('yfboww' + x)", "funcname": "main_solution"}
rule