s = list(input())
rs = []

maxcnt = 0

for i in range(len(s)):
    rs.insert(0,s[i])
    cnt = 0
    for j in range(len(rs)):
        if s[j]==rs[j]:
            cnt+=1
    if cnt>maxcnt:maxcnt=cnt

for i in range(len(rs)-1):
    s.pop(0)
    cnt = 0
    if len(s)<maxcnt:break
    for j in range(len(s)):
        if s[j]==rs[j]:
            cnt+=1
    if cnt>maxcnt:maxcnt=cnt

print(maxcnt)