You are given a code:

def main_solution(x):
    return func_4(func_5('kyzthu', 'rx'))

Can you predict the output of `main_solution("rdlhqrz")` 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": "rdlhqrz"}, "ref_output": "rxkyzthu", "ref_code": "def main_solution(x):\n    return func_4(func_5('kyzthu', 'rx'))", "funcname": "main_solution"}
rule