You are given a code:

def main_solution(x):
    return func_3('vjg')

Can you predict the output of `main_solution("tlvzn")` 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": "tlvzn"}, "ref_output": "gjv", "ref_code": "def main_solution(x):\n    return func_3('vjg')", "funcname": "main_solution"}
rule