You are given a code:

def main_solution(x):
    return (func_23('hff', 2) + func_13('nahmt', '-'))

Can you predict the output of `main_solution("chpl")` 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": "chpl"}, "ref_output": "hff1n-a-h-m-t", "ref_code": "def main_solution(x):\n    return (func_23('hff', 2) + func_13('nahmt', '-'))", "funcname": "main_solution"}
rule