You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'qgsq'), func_15('gwzb'))

Can you predict the output of `main_solution("yjtcj")` 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": "yjtcj"}, "ref_output": "q\u00abggs\u00bbq\u00abywj\u00bbt\u00abczj\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'qgsq'), func_15('gwzb'))", "funcname": "main_solution"}
rule