You are given a code:

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

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