def ArrayChallenge(a):
    p = []
    
    for i in range(0, len(a), 2):
        f = False
        for j in range(0, len(a), 2):
            if a[i] == a[j+1] and a[i+1] == a[j]:
                f = True
                break
        if not f:
            p.append(a[i])
            p.append(a[i+1])
    
    return "yes" if not p else ",".join(map(str, p))

import sys

def StringChallenge(str):
    while True:
        new_str = str.replace("ab", "c").replace("ac", "b").replace("bc", "a")
        if new_str == str:
            break
        str = new_str
    return len(str)

for _ in range(2):
    pass

for _ in range(2):
    pass

str = sys.stdin.readline().strip()
print(StringChallenge(str))

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