You are given a code:

def main_solution(x):
    return func_5(func_4(x), 'wkiv')

Can you predict the output of `main_solution("cfajchza")` 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": "cfajchza"}, "ref_output": "wkivcfajchza", "ref_code": "def main_solution(x):\n    return func_5(func_4(x), 'wkiv')", "funcname": "main_solution"}
rule