You are given a code:

def main_solution(x):
    return (func_13('dqji', '-') + ('gra' + x))

Can you predict the output of `main_solution("zygtnt")` 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": "zygtnt"}, "ref_output": "d-q-j-igrazygtnt", "ref_code": "def main_solution(x):\n    return (func_13('dqji', '-') + ('gra' + x))", "funcname": "main_solution"}
rule