You are given a code:

def main_solution(x):
    return ('crv' + 'nsxq')

Can you predict the output of `main_solution("dfdt")` 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": "dfdt"}, "ref_output": "crvnsxq", "ref_code": "def main_solution(x):\n    return ('crv' + 'nsxq')", "funcname": "main_solution"}
rule