S = input()
res = set()
posi = [0,0,0]
res.add(tuple(posi))
al = ['a','c','b',1]
for i in range(len(S)):
    id = al.index(S[i])
    if al[-1]==1:
        if id==0:
            posi[1]+=2
            al[0],al[1],al[2] = al[1],al[2],al[0]
        elif id==1:
            posi[2]+=2
        else:
            posi[0]+=2
            al[0],al[1],al[2] = al[2],al[0],al[1]
    else:
        if id==0:
            posi[0]-=2
            al[0],al[1],al[2] = al[1],al[2],al[0]
        elif id==1:
            posi[2]-=2
        else:
            posi[1]-=2
            al[0],al[1],al[2] = al[2],al[0],al[1]
    al[-1]*=-1
    res.add(tuple(posi))
print(len(res))