You are given a code:

def main_solution(x):
    return func_22(func_17('kldr'))

Can you predict the output of `main_solution("ptxv")` 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": "ptxv"}, "ref_output": "rdlk", "ref_code": "def main_solution(x):\n    return func_22(func_17('kldr'))", "funcname": "main_solution"}
rule