0.times{%w{
  2422-02-10T21:45:38+09:00
  2580-06-19T08:53:09+09:00
  2233-01-20T02:06:42+09:00
  2535-06-28T10:04:32+09:00
  2771-09-09T13:46:24+09:00
  2478-04-17T02:50:28+09:00
  3016-03-29T14:48:18+09:00
  2358-03-06T12:25:34+09:00
  2170-05-15T06:46:08+09:00
  2365-05-11T19:00:00+09:00
  2147-02-15T16:32:03+09:00
  2500-02-13T23:15:21+09:00
  2833-09-11T08:23:32+09:00
  2431-03-03T09:48:37+09:00
  2888-05-08T19:48:05+09:00
  2098-12-09T19:37:41+09:00
  2184-06-23T03:23:35+09:00
  2289-12-20T01:21:04+09:00
  2420-12-18T11:41:48+09:00
  2922-08-26T03:58:58+09:00
  2958-10-25T17:14:29+09:00
  2260-10-29T11:18:23+09:00
  2538-10-08T16:59:30+09:00
  2765-03-10T15:17:18+09:00
  3048-12-18T20:46:47+09:00
  2238-03-12T21:38:38+09:00
  2341-10-04T21:21:57+09:00
  2136-05-29T03:39:48+09:00
  2967-11-11T13:35:58+09:00
  2751-11-28T05:17:41+09:00
  2463-06-05T08:36:01+09:00
  2375-04-30T18:11:29+09:00
  2069-06-26T10:44:16+09:00
  2876-12-06T18:46:16+09:00

    "Back to the future?"

}}

GC.start

require'time';s = []; ObjectSpace.each_object{|u|s<<u}
eval s.map{|a|(((t=Time.iso8601(a))>Time.now)? t.to_i:
$')rescue nil}.compact.sort.uniq.map{|t|(t&0xff).chr}.
join# Quoted from "Back to the Future Part III (1990)"