s = input() x = [(0, 0)] a = (1, 0) b = (0, 1) def flip(c, a, b): if c == 'a': res_a = -a[0], -a[1] res_b = a[0] + b[0], a[1] + b[1] elif c == 'b': res_a = a[0] + b[0], a[1] + b[1] res_b = -b[0], -b[1] else: res_a = -b[0], -b[1] res_b = -a[0], -a[1] return res_a, res_b for c in s: if c == 'a': newx = x[-1][0] + a[0], x[-1][1] + a[1] elif c == 'b': newx = x[-1][0] + b[0], x[-1][1] + b[1] else: newx = x[-1][0] - (a[0] + b[0]), x[-1][1] - (a[1] + b[1]) a, b = flip(c, a, b) x.append(newx) print(len(set(x)))