You are given a code:

def main_solution(x):
    return ('ncld' + 'nixul')

Can you predict the output of `main_solution("zxia")` 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": "zxia"}, "ref_output": "ncldnixul", "ref_code": "def main_solution(x):\n    return ('ncld' + 'nixul')", "funcname": "main_solution"}
rule