def main():
    import sys
    S = sys.stdin.readline().strip()
    vec = {'a': (1, 0), 'b': (0, 1), 'c': (1, 1)}
    x, y = 0, 0
    state = 0
    visited = {(x, y, state)}
    count = 1  # initial state

    for c in S:
        dx, dy = vec[c]
        sign = 1 if state == 0 else -1
        x += dx * sign
        y += dy * sign
        state = 1 - state
        key = (x, y, state)
        if key not in visited:
            visited.add(key)
            count += 1

    print(count)

if __name__ == "__main__":
    main()