ary = []
c = 0

("A".."Z").each do |alph|
  ary << alph
end

str = gets.chomp


ary2 = []
ary2 = str.chars
ary2.each do |i|
  c += 1
  ary.each do |ii|
    if i == ii
      num = ary.index(ii) - c
      while num < 0
        num += 26
      end
      print ary[num]
    end
  end
end