def p2(data):
    inputs=list(data)
    ref = 0
    x=0
    y=0
    inv=0
    history = set()
    history.add((x,y))
    for _in in inputs:
        if 0==ref:
            if _in == 'a':
                if inv:
                    y+=1
                else:
                    y-=1
            elif _in == 'b':
                x+=1
                ref=2
            else:
                x-=1
                ref=1
        elif 1==ref:
            if _in == 'b':
                if inv:
                    y+=1
                else:
                    y-=1
            elif _in == 'c':
                x+=1
                ref=0
            else:
                x-=1
                ref=2
        else:
            if _in == 'c':
                if inv:
                    y+=1
                else:
                    y-=1
            elif _in == 'a':
                x+=1
                ref=1
            else:
                x-=1
                ref=0
        history.add((x,y))
        inv^=1
    print(len(history))


from sys import stdin
input = stdin.readline

p2(list(input().rstrip()))