#!/usr/bin/env ruby

require 'zipf'

windows = []
cur = []
cur_sz = 0
while line = STDIN.gets
  if cur_sz >= 1000
    windows << cur
    cur = []
  else
    cur << line.strip
    cur_size += cur[-1].split.size
  end
end

windows.each { |w|
  h = {}
  h.default = 0
  w.each { |seg|
    ngrams(seg, 4) { |ng|
      h[ng] += 1
    }
  }
  puts h
}