S = input()

da = [1, 0]
db = [0, 1]
dc = [-1, -1]
nx = 0
ny = 0

memo = set()
memo.add((nx, ny))
for s in S:
    if s == "a":
        dx, dy = da
        da[0] *= -1
        db[0] *= -1
        dc[0] *= -1
    elif s == "b":
        dx, dy = db
        da[1] *= -1
        db[1] *= -1
        dc[1] *= -1
    else:
        dx, dy = dc
        da[0] *= -1
        db[0] *= -1
        dc[0] *= -1
        da[1] *= -1
        db[1] *= -1
        dc[1] *= -1
    nx += dx
    ny += dy
    memo.add((nx, ny))
print(len(memo))