s = list(str(input()))
S = []
for c in s:
    if c == 'a':
        S.append(0)
    elif c == 'b':
        S.append(1)
    else:
        S.append(2)

S.reverse()
d = set()
n = len(S)
cur = (0, 0, 0)
d.add(cur)
ans = 1
pre = -1
for i in range(n):
    c = S.pop()
    pos = [0, 0, 0]
    if pre != c:
        for i in range(3):
            if i != c:
                pos[i] = cur[i]
            else:
                pos[i] = cur[i]+1
        pre = c
    else:
        for i in range(3):
            if i != c:
                pos[i] = cur[i]
            else:
                pos[i] = cur[i]-1
        pre = -1
    pos = tuple(pos)
    if pos not in d:
        ans += 1
        d.add(cur)
    cur = pos
print(ans)