You are given a code:

def main_solution(x):
    return func_20(func_20('ida', x), func_13('vlptz', '_'))

Can you predict the output of `main_solution("ohidnyknz")` 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": "ohidnyknz"}, "ref_output": "ivo_dlh_api_dtn_yzknz", "ref_code": "def main_solution(x):\n    return func_20(func_20('ida', x), func_13('vlptz', '_'))", "funcname": "main_solution"}
rule