require 'rubygems'
require 'sinatra'
require 'rack/utils'

@@datastore = []

get '/' do
  if params[:t]
    @@datastore.unshift(Rack::Utils.unescape(params[:t]))
    "a"
  else
    "I'm Tiny!"
  end
end

get '/T' do
  halt 404
end

get '/a' do
  @@datastore.pop
end