You are given a code:

def main_solution(x):
    return func_20(func_20('wtniwy', x), func_15(x))

Can you predict the output of `main_solution("zphgrvmtn")` 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": "zphgrvmtn"}, "ref_output": "w\u00abzzt\u00bbp\u00abnph\u00bbi\u00abghw\u00bbr\u00abygv\u00bbm\u00abtrn\u00bb\u00abv\u00bb\u00abm\u00bb\u00abt\u00bb\u00abn\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('wtniwy', x), func_15(x))", "funcname": "main_solution"}
rule