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? 

full_context: Document 1: Abramovich Flyer: The Abramovich Flyer was an early aircraft built by Russian aviator Vsevolod Mikhailovich Abramovich in 1912, based on the Wright brothers' designs he had seen while working for their German subsidiary. Differences from the Wright designs of the time included wheeled undercarriage and conventional empennage replacing the canard the Wrights used. Abramovich retained the wing warping technique the Wrights used for banking the aircraft, but controlled this with a control stick rather than the hip-controlled harness of the Wrights' design. Using this aircraft, Abramovich was successful in setting many early aviation records in Russia, including carrying several passengers.
Document 2: 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.
Document 3: 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.
Document 4: Sukhoi: Nine years prior to the creation of the bureau, Pavel Sukhoi, a Soviet Russian aerospace engineer, took over team no. 4 of the CAHI's AGOS aviation, flying boat aviation and aircraft prototype engineering facility, in October 1930. Under Sukhoi's leadership, the team of the future design bureau started to take shape. The team, under the Tupolev OKB, produced experimental fighters such as the I-3, I-14, and the DIP, a record-breaking RD aircraft, the Tupolev ANT-25, flew by famous Soviet aviators, Valery Chkalov and Mikhail Gromov, and the long-range bombers such as the Tupolev TB-1 and the Tupolev TB-3.
Document 5: Sikorsky S-1: The Sikorsky S-1 was the first fixed wing aircraft design by Igor Sikorsky. In February 1910 work began on the pusher configured biplane powered by a 15 hp Anzani three-cylinder, air-cooled engine. The machine was completed in April and Sikorsky began his first attempts at flight. In early May during a take-off attempt on a windy day the machine briefly became airborne due mostly to the fact it had a favorable headwind. Further attempts were less successful and Sikorsky disassembled it saving the main wing section to construct the S-2.
Document 6: Sikorsky S-37: The Sikorsky S-37 was an American twin-engine aircraft built by the Sikorsky Manufacturing Corporation. Both examples of the series were completed in 1927. The S-37 was specifically designed to compete for the Orteig Prize and would be the last land based fixed-wing aircraft Sikorsky would produce.
Document 7: Sikorsky S-30: The Sikorsky S-30 was a proposed aircraft design by Igor Sikorsky to be built by the Sikorsky Manufacturing Corporation at Roosevelt, New York in 1925. The twin engine biplane was to have been used on mail routes or configured as a commercial passenger airliner. No examples of the S-30 were ever manufactured.
Document 8: Sikorsky Ilya Muromets: The Sikorsky "Ilya Muromets" (Russian: Сикорский Илья Муромец ) (Sikorsky S-22, S-23, S-24, S-25, S-26 and S-27) were a class of Russian pre-World War I large four-engine commercial airliners and military heavy bombers used during World War I by the Russian Empire. The aircraft series was named after Ilya Muromets, a hero from Slavic mythology. The series was based on the Russky Vityaz or Le Grand, the world's first four-engined aircraft, designed by Igor Sikorsky. The Ilya Muromets aircraft as it appeared in 1913 was a revolutionary design, intended for commercial service with its spacious fuselage incorporating a passenger saloon and washroom on board. During World War I, it became the first four-engine bomber to equip a dedicated strategic bombing unit. This heavy bomber was unrivaled in the early stages of the war, as the Central Powers had no aircraft capable enough to rival it until much later. The Zeppelin-Staaken R.VI of 1916-17 was the only example of any of the Imperial German "Riesenflugzeug" airframe designs to be produced in any quantity during World War I.
Document 9: Robinson R44: The Robinson R44 is a four-seat light helicopter produced by Robinson Helicopter Company since 1992. Based on the company's two-seat Robinson R22, the R44 features hydraulically assisted flight controls. It was first flown on 31 March 1990 and received FAA certification in December 1992, with the first delivery in February 1993.
Document 10: 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.
Document 11: 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."
Document 12: Sikorsky S-2: The Sikorsky S-2 was the second fixed wing aircraft designed by Igor Sikorsky using the main wing section from the S-1 and a 25 hp Anzani three-cylinder engine in a tractor configuration. During the first flight attempt on June 3, 1910 the biplane reached a height of two to four feet and traveled approximately 200 yards. After several successful flights the S-2 was completely destroyed on June 30 when Sikorsky inadvertently stalled the underpowered aircraft at an altitude of 70 feet.
Document 13: 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.
Document 14: Bell UH-1 Iroquois: The Bell UH-1 Iroquois (nicknamed "Huey") is a utility military helicopter powered by a single turboshaft engine, with two-blade main and tail rotors. The first member of the prolific Huey family, it was developed by Bell Helicopter to meet a United States Army's 1952 requirement for a medical evacuation and utility helicopter, and first flew in 1956. The UH-1 was the first turbine-powered helicopter to enter production in 1960 for the United States military, and more than 16,000 have been built since.
Document 15: 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.
ground_truth: S-6-A