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