You are given a code:

def main_solution(x):
    return ('ofpqn' + 'kbs')

Can you predict the output of `main_solution("flvyyos")` 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": "flvyyos"}, "ref_output": "ofpqnkbs", "ref_code": "def main_solution(x):\n    return ('ofpqn' + 'kbs')", "funcname": "main_solution"}
rule