s = input()

x = 0
y = 0
cnt = 0

se = set()
se.add((0, 0))


for c in s:
    t = 0
    if c == 'b':
        t = 1
    elif c == 'c':
        t = 2
    if cnt % 2 == 0:
        now = -x + 2 * t
        now %= 3
        if now == 0:
            y -= 1
        if now == 2:
            x += 1
        if now == 1:
            x -= 1
    else:
        now = y * 3 + t * 2-x
        now %= 3
        if now == 1:
            x += 1
        if now == 2:
            x -= 1
        if now == 0:
            y += 1
    se.add((x, y))
    cnt += 1


print(len(se))