Input: Read this: The name of the winning team is engraved on the silver band around the base as soon as the final has finished, in order to be ready in time for the presentation ceremony. This means the engraver has just five minutes to perform a task which would take twenty under normal conditions, although time is saved by engraving the year on during the match, and sketching the presumed winner. During the final, the trophy wears is decorated with ribbons in the colours of both finalists, with the loser's ribbons being removed at the end of the game. Traditionally, at Wembley finals, the presentation is made at the Royal Box, with players, led by the captain, mounting a staircase to a gangway in front of the box and returning by a second staircase on the other side of the box. At Cardiff the presentation was made on a podium on the pitch.
Question: When does the engraving take place? 

Output: as soon as the final has finished, in order to be ready in time for the presentation ceremony.


Input: Read this: Resistance to infection (immunity) may be acquired following a disease, by asymptomatic carriage of the pathogen, by harboring an organism with a similar structure (crossreacting), or by vaccination. Knowledge of the protective antigens and specific acquired host immune factors is more complete for primary pathogens than for opportunistic pathogens. There is also the phenomenon of herd immunity which offers a measure of protection to those otherwise vulnerable people when a large enough proportion of the population has acquired immunity from certain infections.
Question: What is resistance to infection known informally as?

Output: unanswerable


Input: Read this: Built in 1815, Union Street was at the heart of Plymouth's historical culture. It became known as the servicemen's playground, as it was where sailors from the Royal Navy would seek entertainment of all kinds. During the 1930s, there were 30 pubs and it attracted such performers as Charlie Chaplin to the New Palace Theatre. It is now the late-night hub of Plymouth's entertainment strip, but has a reputation for trouble at closing hours.
Question: In what year was Union Street constructed?

Output: 1815


Input: Read this: In the 20th century, Portugal engaged in two major conflicts: World War I and the Portuguese Colonial War (1961–1974). After the end of the Portuguese Empire in 1975, the Portuguese Armed Forces have participated in peacekeeping missions in East Timor, Bosnia, Kosovo, Afghanistan, Somalia, Iraq (Nasiriyah) and Lebanon. Portugal also conducted several independent unilateral military operations abroad, as were the cases of the interventions of the Portuguese Armed Forces in Angola in 1992 and in Guinea-Bissau in 1998 with the main objectives of protecting and withdrawing of Portuguese and foreign citizens threatened by local civil conflicts.
Question: What are two examples of independent Portuguese unilateral military operations conducted abroad?

Output:
Angola in 1992 and in Guinea-Bissau in 1998