S = input()
x = 0 
y = 0
cnt = 0
a = -1
b = 1
c = -1
LIST = [(0,0)]
for i in range(len(S)):
    if S[i]=='a':
        y += a
        a = -a
    if S[i]=='b':
        x += b
        b = -b
        a = -a
        c = -c
    if S[i]=='c':
        x += c
        b = -b
        a = -a
        c = -c

    LIST.append((x,y))
print(len(set(LIST)))