You are given a code:

def main_solution(x):
    return func_13(func_5('lxts', 'yqsi'), '|')

Can you predict the output of `main_solution("vyby")` 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": "vyby"}, "ref_output": "y|q|s|i|l|x|t|s", "ref_code": "def main_solution(x):\n    return func_13(func_5('lxts', 'yqsi'), '|')", "funcname": "main_solution"}
rule