You are given a code:

def main_solution(x):
    return ('xvb' + 'rxln')

Can you predict the output of `main_solution("gqkkrwipxe")` 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": "gqkkrwipxe"}, "ref_output": "xvbrxln", "ref_code": "def main_solution(x):\n    return ('xvb' + 'rxln')", "funcname": "main_solution"}
rule