You are given a code:

def main_solution(x):
    return func_4(('ecj' + 'bbznt'))

Can you predict the output of `main_solution("qinjz")` 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": "qinjz"}, "ref_output": "ecjbbznt", "ref_code": "def main_solution(x):\n    return func_4(('ecj' + 'bbznt'))", "funcname": "main_solution"}
rule