Question: The Sikorsky R-4 was a two-seat helicopter designed by a man that won the highest awardat the 1912 Moscow Aviation Exhibition for what airplane? 

Context paragraphs:
Sud-Ouest Djinn: The Sud-Ouest S.O.1221 Djinn is a French two-seat light helicopter designed and manufactured by aircraft manufacturer Sud-Ouest, which later became Sud Aviation.  It was the first indigenously-developed French helicopter, as well as being one of the first practical European helicopters to be produced.  The Djinn was also the first rotorcraft to harness tip-jet propulsion to enter production.

List of surviving Sikorsky CH-54s: The Sikorsky CH-54 Tarhe is a twin-engine heavy-lift helicopter designed by Sikorsky Aircraft for the United States Army.  The civil version is the Sikorsky S-64 Skycrane.  The Army purchased 105 CH-54s before its discontinuation.  The S-64 Aircrane is still in production.  There are currently numerous complete and partial airframes in existence for this aircraft.  Some CH-54's and some S-64's (both E and F models) are owned, and have been remanufactured, by Erickson Air-Crane Inc."

Sikorsky R-6: The Sikorsky R-6 was an American-built light two-seat helicopter of the 1940s.  In Royal Air Force and Royal Navy service, it was named the Hoverfly II.

Sud-Ouest Ariel: The Sud-Ouest Ariel is a French two-seat light helicopter designed and built by Sud-Ouest later Sud Aviation.  The helicopter rotors were driven by compressed-air jets at the end of each blade.

Pitcairn XO-61: The Pitcairn XO-61 was an American autogyro designed by Pitcairn Aircraft.  One of the last autogyros produced, in competition with the Kellett YO-60 and the Sikorsky R-4, it fell victim to cooling problems with its rear-mounted engine and the coming of the helicopter with its ability to hover.

Sikorsky R-4: The Sikorsky R-4 was a two-seat helicopter designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine.  The R-4 was the world's first large-scale mass-produced helicopter and the first helicopter used by the United States Army Air Forces, the United States Navy, the United States Coast Guard and the United Kingdom's Royal Air Force and Royal Navy.  In U.S. Navy and U.S. Coast Guard service, the helicopter was known as the Sikorsky HNS-1.  In British service, it was known as the Hoverfly.

Igor Sikorsky: Igor Ivanovich Sikorsky (Russian: И́горь Ива́нович Сико́рский ; ] , "Ígor' Ivánovič Sikórskij"; , "Ihor Ivanovych Sikorskyi"; May 25, 1889 – October 26, 1972), was a Russian-American aviation pioneer in both helicopters and fixed-wing aircraft.  First success came with the S-2, the second aircraft of his design and construction.  His fifth airplane, the S-5, won him national recognition as well as F.A.I. license Number 64.  His S-6-A received the highest award at the 1912 Moscow Aviation Exhibition.  and in the fall of that year the aircraft won for its young designer, builder and pilot first prize in the military competition at Petrograd.

Vought-Sikorsky VS-300: The Vought-Sikorsky VS-300 (or S-46) was a single-engine helicopter designed by Igor Sikorsky.  It had a single three-blade rotor originally powered by a 75 horsepower (56 kW) engine.  The first "free" flight of the VS-300 was on 13 May 1940.  The VS-300 was the first successful single lifting rotor helicopter in the United States and the first successful helicopter to use a single vertical-plane tail rotor configuration for antitorque.  With floats attached, it became the first practical amphibious helicopter.

Sikorsky SH-3 Sea King: The Sikorsky SH-3 Sea King (company designation S-61) is an American twin-engined anti-submarine warfare (ASW) helicopter designed and built by Sikorsky Aircraft.  A landmark design, it was the world's first amphibious helicopter and one of the first ASW rotorcraft to use turboshaft engines.

Sikorsky S-67 Blackhawk: The Sikorsky S-67 Blackhawk was a private-venture, prototype attack helicopter built in 1970 with Sikorsky Aircraft research and development (R&D) funds.  A tandem, two-seat aircraft designed around the dynamic drive and rotor systems of the Sikorsky S-61, it was designed to serve as an attack helicopter or to transport up to eight troops into combat.

Supporting paragraphs: Sikorsky R-4 Igor Sikorsky
Answer: S-6-A