You are given a code:

def main_solution(x):
    return func_13((x + 'altkaz'), '|')

Can you predict the output of `main_solution("vlvliryokd")` 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": "vlvliryokd"}, "ref_output": "v|l|v|l|i|r|y|o|k|d|a|l|t|k|a|z", "ref_code": "def main_solution(x):\n    return func_13((x + 'altkaz'), '|')", "funcname": "main_solution"}
rule