class_docstr: Shift cipher.
class_docstr_tok: ["Shift","cipher","."]
code: def distribution(self):
      return [0.4, 0.3, 0.2, 0.08, 0.02]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from collections import deque
  import numpy
  from tensor2tensor.data_generators import algorithmic
  from tensor2tensor.utils import registry
label_desc: Use image node_id 2 for calling the AlgorithmicCipherShift5 obj's underlying member method code with example usage: obj.distribution() and returns: list