You are given a code:

def main_solution(x):
    return ('vlvnac' + 'rfzv')

Can you predict the output of `main_solution("coqdil")` 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": "coqdil"}, "ref_output": "vlvnacrfzv", "ref_code": "def main_solution(x):\n    return ('vlvnac' + 'rfzv')", "funcname": "main_solution"}
rule