You are given a code:

def main_solution(x):
    return func_5(('uqa' + 'aoqfew'), 'kqze')

Can you predict the output of `main_solution("rggmgb")` 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": "rggmgb"}, "ref_output": "kqzeuqaaoqfew", "ref_code": "def main_solution(x):\n    return func_5(('uqa' + 'aoqfew'), 'kqze')", "funcname": "main_solution"}
rule