S = list(input())
SS = set()
x, y = 0, 0
SS.add((0, 0))
for s in S:
    if s == "a":
        if x % 3 == 1:
            x += 1
        elif x % 3 == 2:
            x -= 1
        else:
            if (x - 3 * y) % 6 == 0:
                y -= 1
            else:
                y += 1
    elif s == "b":
        if x % 3 == 0:
            x += 1
        elif x % 3 == 1:
            x -= 1
        else:
            if (x - 3 * y) % 6 == 2:
                y -= 1
            else:
                y += 1
    else:
        if x % 3 == 2:
            x += 1
        elif x % 3 == 0:
            x -= 1
        else:
            if (x - 3 * y) % 6 == 4:
                y -= 1
            else:
                y += 1
    SS.add((x, y))

print(len(SS))