You are given a code:

def main_solution(x):
    return ('gpqss' + 'ugaf')

Can you predict the output of `main_solution("rfosxsl")` 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": "rfosxsl"}, "ref_output": "gpqssugaf", "ref_code": "def main_solution(x):\n    return ('gpqss' + 'ugaf')", "funcname": "main_solution"}
rule