-- q0 = q00
trans (1,st) c = [(1,c:st), (2,st), (2,c:st)]
-- q1
trans (2,s:st) c = [(2,st) | s == c]
trans (2,[]) c = [(3,[c]),(4,[]),(4,[c])]
-- q2
trans (3,st) c = [(3,c:st), (4,st), (4,c:st)]
-- q3
trans (4,s:st) c = [(4,st) | s == c]
trans (4,[]) c = [(5,[]),(6,[])]
-- q5
trans (5,[]) c = [(5,[]),(6,[])]
-- q6
trans (6,st) c = [(6,c:st), (7,st), (7,c:st)]
-- q7
trans (7,s:st) c = [(7,st) | s == c]
trans (7,[]) c = [] -- 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 = foldr (concatMap.flip trans) [(1,[])]
compute = length . filter ((7,[]) ==) . transall

main = do
  l <- getLine
  print $ compute l