aaa = raw_input()
bbb = ""
for i in range(len(aaa)):
  if ord("A") > ord(aaa[i])-i-1:
    bbb = bbb + chr(ord("Z")-(i-(ord(aaa[i])-ord("A"))))
  else:
    bbb = bbb + chr(ord(aaa[i])-i-1)
print bbb