You are given a code:

def main_solution(x):
    return ('qhc' + 'qkltoo')

Can you predict the output of `main_solution("dfmnlfs")` 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": "dfmnlfs"}, "ref_output": "qhcqkltoo", "ref_code": "def main_solution(x):\n    return ('qhc' + 'qkltoo')", "funcname": "main_solution"}
rule