You are given a code:

def main_solution(x):
    return func_13('dzyqxr', '-')

Can you predict the output of `main_solution("spmb")` 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": "spmb"}, "ref_output": "d-z-y-q-x-r", "ref_code": "def main_solution(x):\n    return func_13('dzyqxr', '-')", "funcname": "main_solution"}
rule