S = input()
p = ["abc", "cab", "bca"]
s = set([(0, 0)])
x, y = 0, 0
cur = 0
for i in range(len(S)):
    ind = p[cur].index(S[i])
    cur += ind
    cur %= 3
    if i % 2:
        if ind == 0:
            x += 1
            y += 1
        if ind == 1:
            y -= 2
        if ind == 2:
            x -= 1
            y += 1
    else:
        if ind == 0:
            x -= 1
            y -= 1
        if ind == 1:
            x += 1
            y -= 1
        if ind == 2:
            y += 2
    s.add((x, y))
print(len(s))