You are given a code:

def main_solution(x):
    return ('pnb' + 'qoccr')

Can you predict the output of `main_solution("uzkfl")` 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": "uzkfl"}, "ref_output": "pnbqoccr", "ref_code": "def main_solution(x):\n    return ('pnb' + 'qoccr')", "funcname": "main_solution"}
rule