You are given a code:

def main_solution(x):
    return func_20(func_13(x, '|'), func_5(x, 'zskx'))

Can you predict the output of `main_solution("sztsfncr")` 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": "sztsfncr"}, "ref_output": "sz|szk|xts|zst|sff|nnc|rc|r", "ref_code": "def main_solution(x):\n    return func_20(func_13(x, '|'), func_5(x, 'zskx'))", "funcname": "main_solution"}
rule