import sys

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for k in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
sys.setrecursionlimit(10**9)
INF = 10**19
MOD = 10**9 + 7
EPS = 10**-10

S = input()
N = len(S)

h = w = 0
visited = {}
visited[(h, w)] = 1
pos = {'a': 'ud', 'b': 'l', 'c': 'r'}
for i in range(N):
    nxd = pos[S[i]]
    if nxd == 'ud':
        if i % 2 == 0:
            h -= 1
        else:
            h += 1
    elif nxd == 'l':
        # ud -> l, r -> ud, l -> r
        for c in 'abc':
            if pos[c] == 'ud':
                pos[c] = 'l'
        for c in 'abc':
            if pos[c] == 'r':
                pos[c] = 'ud'
        pos[S[i]] = 'r'
        w -= 1
    else:
        # ud -> r, l -> ud, r -> l
        for c in 'abc':
            if pos[c] == 'ud':
                pos[c] = 'r'
        for c in 'abc':
            if pos[c] == 'l':
                pos[c] = 'ud'
        pos[S[i]] = 'l'
        w += 1
    visited[(h, w)] = 1

ans = len(visited)
print(ans)