#!/usr/bin/env python3
# from typing import *



# def solve(S: str) -> int:
def solve(S):
    t = set()
    t.add((0, 0))
    x, y = 0, 0
    tri = ['a', 'b', 'c']
    tri_upper = True
    for s in S:
        index = tri.index(s)
        if tri_upper:
            if index == 0:
                x -= 1
                tri = [tri[2], tri[0], tri[1]]
            elif index == 1:
                x += 1
                tri = [tri[1], tri[2], tri[0]]
            else:
                y -= 1
                tri = [tri[0], tri[1], tri[2]]
        else:
            if index == 0:
                x -= 1
                tri = [tri[2], tri[0], tri[1]]
            elif index == 1:
                x += 1
                tri = [tri[1], tri[2], tri[0]]
            else:
                y += 1
                tri = [tri[0], tri[1], tri[2]]
        tri_upper = not tri_upper
        t.add((x, y))
    return len(t)

def main():
    S = input()
    a = solve(S)
    print(a)

if __name__ == '__main__':
    main()