You are given a code:

def main_solution(x):
    return func_13(func_20('qkpviq', 'dayxre'), '|')

Can you predict the output of `main_solution("qqopxktzud")` 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": "qqopxktzud"}, "ref_output": "q|d|k|a|p|y|v|x|i|r|q|e", "ref_code": "def main_solution(x):\n    return func_13(func_20('qkpviq', 'dayxre'), '|')", "funcname": "main_solution"}
rule