Input: Dwight D. Eisenhower
The Eisenhowers had two sons. Doud Dwight "Icky" Eisenhower was born September 24, 1917, and died of scarlet fever on January 2, 1921, at the age of three; Eisenhower was mostly reticent to discuss his death. Their second son, John Eisenhower (1922–2013), was born in Denver Colorado. John served in the United States Army, retired as a brigadier general, became an author and served as U.S. Ambassador to Belgium from 1969 to 1971. Coincidentally, John graduated from West Point on D-Day, June 6, 1944. He married Barbara Jean Thompson on June 10, 1947. John and Barbara had four children: David, Barbara Ann, Susan Elaine and Mary Jean. David, after whom Camp David is named, married Richard Nixon's daughter Julie in 1968. John died on December 21, 2013.

What killed Icky Eisenhower?
Output: scarlet fever

Input: Estonia
After the decline of the Teutonic Order following its defeat in the Battle of Grunwald in 1410, and the defeat of the Livonian Order in the Battle of Swienta on 1 September 1435, the Livonian Confederation Agreement was signed on 4 December 1435. The Livonian Confederation ceased to exist during the Livonian War (1558–82). The wars had reduced the Estonian population from about 250–300,000 people before the Livonian War to 120–140,000 in the 1620s. The Grand Duchy of Moscow and Tsardom of Russia also attempted invasions in 1481 and 1558, both of which were unsuccessful .

When was the Livonian Confederation Agreement signed?
Output: 4 December 1435

Input: Anti-aircraft warfare
The most extreme case was the Soviet Union, and this model may still be followed in some countries: it was a separate service, on a par with the navy or ground force. In the Soviet Union this was called Voyska PVO, and had both fighter aircraft and ground-based systems. This was divided into two arms, PVO Strany, the Strategic Air defence Service responsible for Air Defence of the Homeland, created in 1941 and becoming an independent service in 1954, and PVO SV, Air Defence of the Ground Forces. Subsequently these became part of the air force and ground forces respectively

What year did the PVO Strany become independent?
Output: 1954

Input: FC Barcelona
With the new stadium, Barcelona participated in the inaugural version of the Pyrenees Cup, which, at the time, consisted of the best teams of Languedoc, Midi and Aquitaine (Southern France), the Basque Country and Catalonia; all were former members of the Marca Hispanica region. The contest was the most prestigious in that era. From the inaugural year in 1910 to 1913, Barcelona won the competition four consecutive times. Carles Comamala played an integral part of the four-time champion, managing the side along with Amechazurra and Jack Greenwell. The latter became the club's first full-time coach in 1917. The last edition was held in 1914 in the city of Barcelona, which local rivals Espanyol won.

When was the last Pyrenees Cup played?
Output:
1914