Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Example Input: a superscalar cpu design makes a form of parallel computing called instruction-level parallelism inside a single cpu, which allows more work to be done at the same clock rate.
Example Output: superscalar

Example Input: perceneige is a commune.
Example Output: perceneige

Example Input: aethelthryth or etheldreda (about 636 – june 23, 679) was an anglo-saxon saint.
Example Output:
aethelthryth