You are given a code:

def main_solution(x):
    return func_20(func_13(x, '-'), func_13('yxfq', '-'))

Can you predict the output of `main_solution("zurpjvjt")` 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": "zurpjvjt"}, "ref_output": "zy--ux--rf--pq-j-v-j-t", "ref_code": "def main_solution(x):\n    return func_20(func_13(x, '-'), func_13('yxfq', '-'))", "funcname": "main_solution"}
rule