You are given a code:

def main_solution(x):
    return ('mjfej' + 'xxtmbu')

Can you predict the output of `main_solution("surloqld")` 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": "surloqld"}, "ref_output": "mjfejxxtmbu", "ref_code": "def main_solution(x):\n    return ('mjfej' + 'xxtmbu')", "funcname": "main_solution"}
rule