trans c (1,st  ) = [(1,c:st), (2,st), (2,c:st)]
trans c (2,s:st) = [(2,st) | s == c]
trans c (2,[]  ) = [(3,[c]),(4,[]),(4,[c])]
trans c (3,st  ) = [(3,c:st), (4,st), (4,c:st)]
trans c (4,s:st) = [(4,st) | s == c]
trans c (4,[]  ) = [(5,[]),(6,[])]
trans c (5,[]  ) = [(5,[]),(6,[])]
trans c (6,st  ) = [(6,c:st), (7,st), (7,c:st)]
trans c (7,s:st) = [(7,st) | s == c]
trans c (7,[]  ) = [] -- 早すぎ。入力終了でぴったりここに止まったものだけが成功。

transall = foldl (flip (concatMap.trans)) [(1,[])]
corrects = filter ((7,[]) ==) . transall
compute = length . corrects

main = do
  l <- getLine
  print $ compute l