def main():
    from math import sqrt,sin,cos,tan,ceil,radians,floor,gcd,exp,log,log10,log2,factorial,fsum
    from heapq import heapify, heappop, heappush
    from bisect import bisect_left, bisect_right
    from copy import deepcopy
    import copy
    import random
    from collections import deque,Counter,defaultdict
    from itertools import permutations,combinations
    from decimal import Decimal,ROUND_HALF_UP
    #tmp = Decimal(mid).quantize(Decimal('0'), rounding=ROUND_HALF_UP)
    from functools import lru_cache, reduce
    #@lru_cache(maxsize=None)
    from operator import add,sub,mul,xor,and_,or_,itemgetter
    INF = 10**18
    mod1 = 10**9+7
    mod2 = 998244353
    
    #DecimalならPython
    #再帰ならPython!!!!!!!!!!!!!!!!!!!!!!!!!!
    
    
    '''
    これ、移動させても被りはしないのか
    一辺を２とする
    上向き三角のとき
    右に移動するとき、(1,√3)移動する
    下に移動するとき、(0,-1)移動する
    左に移動するとき、(-1,√3移動する)
    
    下向き三角のとき
    逆
    '''
    
    S = list(input())
    N = len(S)
    
    st = set()
    
    u = 'a'
    r = 'c'
    l = 'b'
    
    x,y = 0,0
    st.add((x,y))
    rev = 1
    for i in range(N):
        if rev == 1:
            if S[i] == u:
                dx,dy = 0,-1
            elif S[i] == l:
                dx,dy = -1,1
                
                if l == 'b':
                    u = 'c'
                    r = 'b'
                    l = 'a'
                elif l == 'a':
                    u = 'b'
                    r = 'a'
                    l = 'c'
                else:
                    u = 'a'
                    l = 'b'
                    r = 'c'
            else:
                dx,dy = 1,1
                
                if u == 'a':
                    u = 'b'
                    l = 'c'
                    r = 'a'
                elif u == 'b':
                    u = 'c'
                    l = 'a'
                    r = 'b'
                else:
                    u = 'a'
                    r = 'c'
                    l = 'b'
        else:
            if S[i] == r:
                dx,dy = 1,-1
                
                if u == 'a':
                    u = 'b'
                    r = 'a'
                    l = 'c'
                elif u == 'b':
                    u = 'c'
                    r = 'b'
                    l = 'a'
                else:
                    u = 'a'
                    r = 'c'
                    l = 'b'
                
            elif S[i] == u:
                dx,dy = 0,1
                
            else:
                dx,dy = -1,-1
                
                if u == 'a':
                    u = 'c'
                    l = 'a'
                    r = 'b'
                elif u == 'b':
                    u = 'a'
                    l = 'b'
                    r = 'c'
                else:
                    u = 'b'
                    l = 'c'
                    r = 'a'
        
        x += dx
        y += dy
        st.add((x,y))
        
        rev *= -1
    
    print(len(st))
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
if __name__ == '__main__':
    main()