You are given a code:

def main_solution(x):
    return ('kpsja' + 'ugjzd')

Can you predict the output of `main_solution("vngqqpcz")` 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": "vngqqpcz"}, "ref_output": "kpsjaugjzd", "ref_code": "def main_solution(x):\n    return ('kpsja' + 'ugjzd')", "funcname": "main_solution"}
rule