You are given a code:

def main_solution(x):
    return ('qrby' + 'igfx')

Can you predict the output of `main_solution("rbzosw")` 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": "rbzosw"}, "ref_output": "qrbyigfx", "ref_code": "def main_solution(x):\n    return ('qrby' + 'igfx')", "funcname": "main_solution"}
rule