Task: Text Categorization
Input (English): Text:  German submarine U-168 was a Type IXC/40 U-boat of the German Navy (Kriegsmarine) built for service during World War II. Her keel was laid down on March 15 1941 by the Deutsche Schiff- und Maschinenbau AG in Bremen as 'werk' 707. She was launched on March 5 1942 and commissioned on September 10 with Kapitänleutnant Helmuth Pich in command.
Output (English): 6