You are given a code:

def main_solution(x):
    return ('blf' + 'karh')

Can you predict the output of `main_solution("lhumc")` 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": "lhumc"}, "ref_output": "blfkarh", "ref_code": "def main_solution(x):\n    return ('blf' + 'karh')", "funcname": "main_solution"}
rule