You are given a code:

def main_solution(x):
    return func_20(func_13(x, '|'), func_15('cnv'))

Can you predict the output of `main_solution("pmapvwvm")` 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": "pmapvwvm"}, "ref_output": "p\u00ab|cm\u00bb|\u00aban|\u00bbp\u00ab|vv\u00bb|w|v|m", "ref_code": "def main_solution(x):\n    return func_20(func_13(x, '|'), func_15('cnv'))", "funcname": "main_solution"}
rule