You are given a code:

def main_solution(x):
    return func_20(('ghmlwv' + 'ibqhqj'), func_20('gpsz', 'jqktr'))

Can you predict the output of `main_solution("tnggkmn")` 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": "tnggkmn"}, "ref_output": "gghjmplqwsvkizbtqrhqj", "ref_code": "def main_solution(x):\n    return func_20(('ghmlwv' + 'ibqhqj'), func_20('gpsz', 'jqktr'))", "funcname": "main_solution"}
rule