#!/usr/bin/env ruby

normal = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
rot13  = "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM"

STDIN.each_line do |line|
  puts line.tr!(normal, rot13)
end