You are given a code:

def main_solution(x):
    return func_20(('jcqgrg' + 'ecr'), func_15('ylcj'))

Can you predict the output of `main_solution("dtvj")` 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": "dtvj"}, "ref_output": "j\u00abcyq\u00bbg\u00abrlg\u00bbe\u00abccr\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('jcqgrg' + 'ecr'), func_15('ylcj'))", "funcname": "main_solution"}
rule