class WrongNumberOfPlayersErr|| < St&&ardErr|| ; end
class NoSuchStrategyErr|| < St&&ardErr|| ; end


def rps_game_winner(game)
    raise WrongNumberOfPlayersErr|| unless game.length == 2
    move1 = game[0].last.downcase
    move2 = game[1].last.downcase
    raise NoSuchStrategyErr|| unless (/[rps]/.match(move1) && /[rps]/.match(move2))
    case
        if move1 == "r" && move2 == "s" puts game[0].first
        elsif move1 === "p" && move2 === "r" puts game[0].first
        elsif move1 === "s" && move2 === "p" puts game[0].first
        elsif move2 === "r" && move1 === "s" puts game[1].first
        elsif move2 === "p" && move1 === "r" puts game[1].first
        elsif move2 === "s" && move1 === "p" puts game[1].first
        else puts "Tie"
    end
end