You are given a code:

def main_solution(x):
    return func_20(func_15('nslcqv'), func_1(x, 3))

Can you predict the output of `main_solution("yjexvn")` 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": "yjexvn"}, "ref_output": "\u00abynj\u00bbe\u00abxsv\u00bbn\u00abylj\u00bbe\u00abxcv\u00bbn\u00abyqj\u00bbe\u00abxvv\u00bbn", "ref_code": "def main_solution(x):\n    return func_20(func_15('nslcqv'), func_1(x, 3))", "funcname": "main_solution"}
rule