You are given a code:

def main_solution(x):
    return ('qgqa' + 'kfa')

Can you predict the output of `main_solution("lkpszi")` 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": "lkpszi"}, "ref_output": "qgqakfa", "ref_code": "def main_solution(x):\n    return ('qgqa' + 'kfa')", "funcname": "main_solution"}
rule