from collections import deque
from sys import stdin, stdout
input = lambda: stdin.readline().rstrip()
println = stdout.write

def main():
    s1 = input()

    s2 = deque(s1[::-1])
    l = len(s1)
    ans = 0
    for _ in range(l):
        cnt = 0
        for i in range(l):
            if s1[i] == s2[i]:
                cnt += 1
        ans = max(ans, cnt)
        s2.rotate()
    print(ans)

main()