#!/usr/bin/env python3
# -*- encoding: utf-8 -*-

import json
from pathlib import Path
import sys


def main():
    if not Path('r_gdl_lbe.json').exists():
        print('"r_gdl_lbe.json" does not exist')
    elif len(sys.argv) != 3:
        print('Usage:')
        print(f'  {sys.argv[0]} <downloader> <remaining_links>')
    else:
        dldr = sys.argv[1]
        rlnk = int(sys.argv[2])
        data = json.loads(Path('r_gdl_lbe.json').read_bytes())
        print(data[dldr][-rlnk])


if __name__ == '__main__':
    main()