You are given a code:

def main_solution(x):
    return ('nmye' + 'allos')

Can you predict the output of `main_solution("keosrlrb")` 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": "keosrlrb"}, "ref_output": "nmyeallos", "ref_code": "def main_solution(x):\n    return ('nmye' + 'allos')", "funcname": "main_solution"}
rule