You are given a code:

def main_solution(x):
    return (func_20('zkqfje', 'tvf') + func_23('wpzct', 2))

Can you predict the output of `main_solution("njjqdwrnvx")` 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": "njjqdwrnvx"}, "ref_output": "ztkvqffjewpzct1", "ref_code": "def main_solution(x):\n    return (func_20('zkqfje', 'tvf') + func_23('wpzct', 2))", "funcname": "main_solution"}
rule