You are given a code:

def main_solution(x):
    return ('dng' + 'nlphe')

Can you predict the output of `main_solution("ckgjc")` 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": "ckgjc"}, "ref_output": "dngnlphe", "ref_code": "def main_solution(x):\n    return ('dng' + 'nlphe')", "funcname": "main_solution"}
rule