gistfile1.rb

def rps_game_winner(game)
  raise WrongNumberOfPlayersError unless game.length == 2
  2.times do |i|
    raise NoSuchStrategyError unless ['P', 'S', 'R'].include? game[i][1].upcase
  end
  
  first = game[0][1].upcase
  second = game[1][1].upcase
  
  if first == 'P' 
    second == 'S' ? game[1] : game[0]
  elsif first == 'S'
    second == 'R' ? game[1] : game[0]
  else 
    second == 'P' ? game[1] : game[0]
  end
end