mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    S = input().rstrip('\n')

    up = {(0, 0)}
    down = set()
    x, y = 0, 0
    flg = 0
    D = [0, 1, 2]
    for ss in S:
        s = ord(ss) - 97
        #print(D)
        if flg == 0:
            if D[s] == 0:
                x -= 1
            elif D[s] == 1:
                y += 1
                D[0], D[1], D[2] = D[1], D[2], D[0]
            else:
                D[0], D[1], D[2] = D[2], D[0], D[1]
            flg = 1
            down.add((x, y))
        else:
            if D[s] == 0:
                x += 1
            elif D[s] == 1:
                D[0], D[1], D[2] = D[1], D[2], D[0]
            else:
                y -= 1
                D[0], D[1], D[2] = D[2], D[0], D[1]
            flg = 0
            up.add((x, y))
        #print(x, y, D)
    print(len(up) + len(down))
    #print(up)
    #print(down)


if __name__ == '__main__':
    main()