S = input()
x = 0 
y = 0
pattern = 0
LIST = [(0,0)]
for i in range(len(S)):
    if pattern==0:
        if S[i]=='a':
            y -= 1
            pattern=3
        if S[i]=='b':
            x -= 1
            pattern=1
        if S[i]=='c':
            x += 1
            pattern=5
    elif pattern==1:
        if S[i]=='a':
            x -= 1
            pattern=0
        if S[i]=='b':
            x += 1
            pattern=0
        if S[i]=='c':
            y += 1
            pattern=2
    elif pattern==2:
        if S[i]=='a':
            x -= 1
            pattern=5
        if S[i]=='b':
            y -= 1
            pattern=1
        if S[i]=='c':
            x -= 1
            pattern=3
    elif pattern==3:
        if S[i]=='a':
            y += 1
            pattern=0
        if S[i]=='b':
            x += 1
            pattern=4
        if S[i]=='c':
            x -= 1
            pattern=2
    elif pattern==4:
        if S[i]=='a':
            x += 1
            pattern=1
        if S[i]=='b':
            x -= 1
            pattern=3
        if S[i]=='c':
            y -= 1
            pattern=5
    elif pattern==5:
        if S[i]=='a':
            x += 1
            pattern=2
        if S[i]=='b':
            x -= 1
            pattern=0
        if S[i]=='c':
            y += 1
            pattern=4
    LIST.append((y,x))
print(len(set(LIST)))