import sys
def S(): return sys.stdin.readline().rstrip()


S = S()
ANS = set()

state = 1
a,b,c = 0,0,0
ANS.add((a,b,c))

for s in S:
    if state == 1:
        if s == 'a':
            state = 2
            a += 1
        elif s == 'b':
            state = 3
            b += 1
        else:
            state = 4
            c += 1
    elif state == 2:
        if s == 'a':
            state = 1
            a += -1
        elif s == 'b':
            state = 5
            c += -1
        else:
            state = 6
            b += -1
    elif state == 3:
        if s == 'a':
            state = 6
            c += -1
        elif s == 'b':
            state = 1
            b += -1
        else:
            state = 5
            a += -1
    elif state == 4:
        if s == 'a':
            state = 5
            b += -1
        elif s == 'b':
            state = 6
            a += -1
        else:
            state = 1
            c += -1
    elif state == 5:
        if s == 'a':
            state = 4
            b += 1
        elif s == 'b':
            state = 2
            c += 1
        else:
            state = 3
            a += 1
    else:
        if s == 'a':
            state = 3
            c += 1
        elif s == 'b':
            state = 4
            a += 1
        else:
            state = 2
            b += 1
    ANS.add((a,b,c))

print(len(ANS))