out = File::open("out4.txt", "w")
set = [0,1,2,3,4,5,6,7,8,9,10]
set = set.sort{|a,b| b <=> rand*10}.sort{|a,b| b <=> rand*10}
set.first(3).each do |n|
    out << "#{n}\n"
end
out.close