You are given a code:

def main_solution(x):
    return func_4('aewqai')

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