@@words=[]
def u(name, idx)
  puts "What is the #{name} letter?"
  letter = gets.downcase[0]
  @@words = @@words.find_all{|w| w.downcase[idx] == letter}
  puts "That narrows it down to #{@@words.length} words"
end
def main
  File.open('/usr/share/dict/words'){|f|f.each{|l|@@words<<l.chomp}}
  puts "How many letters is it?"
  len = gets.to_i
  @@words = @@words.find_all{|w| w.length == len}
  puts "Hmm.  That matches #{@@words.length} words."
  [[:first,0],[:last,-1]].each{|x| u x[0], x[1]}
  [10,@@words.length].min.times do |i|
    puts "Is it #{@@words[i]}?"
    return "HA! I told you I was smart!" if gets =~ /^y/i
  end
  return "You beat me!"
end
puts main