You are given a code:

def main_solution(x):
    return ('eejbck' + 'nhrd')

Can you predict the output of `main_solution("cptscafn")` 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": "cptscafn"}, "ref_output": "eejbcknhrd", "ref_code": "def main_solution(x):\n    return ('eejbck' + 'nhrd')", "funcname": "main_solution"}
rule