You are given a code:

def main_solution(x):
    return func_13(func_20('ieiy', 'gbylvt'), '-')

Can you predict the output of `main_solution("kipg")` 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": "kipg"}, "ref_output": "i-g-e-b-i-y-y-l-v-t", "ref_code": "def main_solution(x):\n    return func_13(func_20('ieiy', 'gbylvt'), '-')", "funcname": "main_solution"}
rule