# coding:UTF-8
import sys

MOD = 10 ** 9 + 7
INF = float('inf')

S = input()     # 文字列

mp = {(0, 0)}
pos = [0, 0]
mode = [0, 0]

for s in S:
    if (mode == [0, 0] and s == "c") or (mode == [0, 1] and s == "a") or (mode == [0, 2] and s == "b"):
        pos[1] += 1
        mode[0] = 1
        mp.add((pos[0], pos[1]))
    elif (mode == [0, 0] and s == "b") or (mode == [0, 1] and s == "c") or (mode == [0, 2] and s == "a"):
        pos[0] += 1
        mode[0] = 1
        mode[1] = (mode[1] + 1) % 3
        mp.add((pos[0], pos[1]))
    elif (mode == [0, 0] and s == "a") or (mode == [0, 1] and s == "b") or (mode == [0, 2] and s == "c"):
        pos[0] -= 1
        mode[0] = 1
        mode[1] = (mode[1] - 1) % 3
        mp.add((pos[0], pos[1]))
    elif (mode == [1, 0] and s == "c") or (mode == [1, 1] and s == "a") or (mode == [1, 2] and s == "b"):
        pos[1] -= 1
        mode[0] = 0
        mp.add((pos[0], pos[1]))
    elif (mode == [1, 0] and s == "b") or (mode == [1, 1] and s == "c") or (mode == [1, 2] and s == "a"):
        pos[0] += 1
        mode[0] = 0
        mode[1] = (mode[1] + 1) % 3
        mp.add((pos[0], pos[1]))
    elif (mode == [1, 0] and s == "a") or (mode == [1, 1] and s == "b") or (mode == [1, 2] and s == "c"):
        pos[0] -= 1
        mode[0] = 0
        mode[1] = (mode[1] - 1) % 3
        mp.add((pos[0], pos[1]))

print("{}".format(len(mp)))