Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

Example Input: The Delhi Sultanate ( Persian : دهلی سلطان , Urdu : دہلی سلیٹیٹ ) was a Muslim sultanate based mostly in Delhi that stretched over large parts of the Indian subcontinent for 320 years ( 1206 -- 1526 ) . Five dynasties ruled over the Delhi Sultanate sequentially : the Mamluk dynasty ( 1206 -- 90 ) , the Khalji dynasty ( 1290 -- 1320 ) , the Tughlaq dynasty ( 1320 -- 1414 ) , the Sayyid dynasty ( 1414 -- 51 ) , and the Lodi dynasty ( 1451 -- 1526 ) . The sultanate is noted for being one of the few states to repel an attack by the Mongol Empire , and enthroned one of the few female rulers in Islamic history , Razia Sultana , who reigned from 1236 to 1240 .
Example Output: Delhi Sultanate

Example Input: The Taurus - Littrow site was selected with the prediction that the crew would be able to obtain samples of old highland material from the remnants of a landslide event that occurred on the south wall of the valley and the possibility of relatively young , explosive volcanic activity in the area . Although the valley is similar to the landing site of Apollo 15 in that it is on the border of a lunar mare , the advantages of Taurus - Littrow were believed to outweigh the drawbacks , thus leading to its selection as the Apollo 17 landing site .
Example Output: Apollo 17

Example Input: Peptidoglycan , also known as murein , is a polymer consisting of sugars and amino acids that forms a mesh - like layer outside the plasma membrane of most bacteria , forming the cell wall . The sugar component consists of alternating residues of β - ( 1 , 4 ) linked N - acetylglucosamine ( NAG ) and N - acetylmuramic acid ( NAM ) . Attached to the N - acetylmuramic acid is a peptide chain of three to five amino acids . The peptide chain can be cross-linked to the peptide chain of another strand forming the 3D mesh - like layer . Peptidoglycan serves a structural role in the bacterial cell wall , giving structural strength , as well as counteracting the osmotic pressure of the cytoplasm . A common misconception is that peptidoglycan gives the cell its shape ; however , whereas peptidoglycan helps maintain the structural strength of the cell , it is actually the MreB protein that facilitates cell shape . Peptidoglycan is also involved in binary fission during bacterial cell reproduction .
Example Output:
Peptidoglycan