#!/usr/bin/env python3
import sys

sys.path.append('.')
from knurko import knurko, cli

args = cli.parse_args()
try:
    frame_number = knurko(args.filename)
except ValueError as e:
    sys.stderr.write(e + '\n')
    sys.exit(1)
else:
    sys.stdout.write('%d\n' % frame_number)
