Input: Railway electrification system
In the Soviet Union, in the 1970s, a comparison was made between systems electrified at 3 kV DC and 25 kV AC (50 Hz). The results showed that percentage losses in the overhead wires (catenary and contact wires) was over 3 times greater for 3 kV DC than for 25 kV AC. But when the conversion losses were all taken into account and added to overhead wire losses (including cooling blower energy) the 25 kV AC lost a somewhat higher percent of energy than for 3 kV DC. Thus in spite of the much higher losses in the catenary, the 3 kV DC was a little more energy efficient than AC in providing energy from the USSR power grid to the terminals of the traction motors (all DC at that time). While both systems use energy in converting higher voltage AC from the USSR's power grid to lower voltage DC, the conversions for the DC system all took place (at higher efficiency) in the railway substation, while most of the conversion for the AC system took place inside the locomotive (at lower efficiency). Consider also that it takes energy to constantly move this mobile conversion hardware over the rails while the stationary hardware in the railway substation doesn't incur this energy cost. For more details see: Wiki: Soviet Union DC vs. AC.

Which system was used in Soviet Union after all calculations?
Output: 3 kV DC

Input: Charleston, South Carolina
The first settlers primarily came from England, its Caribbean colony of Barbados, and its Atlantic colony of Bermuda. Among these were free people of color, born in the West Indies of alliances and marriages between Africans and Englanders, when color lines were looser among the working class in the early colonial years, and some wealthy whites took black consorts or concubines. Charles Town attracted a mixture of ethnic and religious groups. French, Scottish, Irish, and Germans migrated to the developing seacoast town, representing numerous Protestant denominations. Because of the battles between English "royalty" and the Roman Catholic Church, practicing Catholics were not allowed to settle in South Carolina until after the American Revolution. Jews were allowed, and Sephardic Jews migrated to the city in such numbers that by the beginning of the 19th century, the city was home to the largest and wealthiest Jewish community in North America—a status it held until about 1830.

What religious group was not allowed to settle in South Carolina?
Output: Catholics

Input: Beyoncé
The release of a video-game Starpower: Beyoncé was cancelled after Beyoncé pulled out of a $100 million with GateFive who alleged the cancellation meant the sacking of 70 staff and millions of pounds lost in development. It was settled out of court by her lawyers in June 2013 who said that they had cancelled because GateFive had lost its financial backers. Beyoncé also has had deals with American Express, Nintendo DS and L'Oréal since the age of 18.

What video game did Beyoncé back out of?
Output: Starpower: Beyoncé

Input: Gymnastics
Men's rhythmic gymnastics is related to both Men's artistic gymnastics and wushu martial arts. It emerged in Japan from stick gymnastics. Stick gymnastics has been taught and performed for many years with the aim of improving physical strength and health. Male athletes are judged on some of the same physical abilities and skills as their female counterparts, such as hand/body-eye co-ordination, but tumbling, strength, power, and martial arts skills are the main focus, as opposed to flexibility and dance in women's rhythmic gymnastics. There are a growing number of participants, competing alone and on a team; it is most popular in Asia, especially in Japan where high school and university teams compete fiercely. As of 2002[update], there were 1000 men's rhythmic gymnasts in Japan.[citation needed]

What are the main focus?
Output:
tumbling, strength, power, and martial arts skills are the main focus