You are given a code:

def main_solution(x):
    return ('grunj' + 'ejns')

Can you predict the output of `main_solution("qsvzkgcl")` 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": "qsvzkgcl"}, "ref_output": "grunjejns", "ref_code": "def main_solution(x):\n    return ('grunj' + 'ejns')", "funcname": "main_solution"}
rule