#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define REP(i,n) for(int i=0,_n=(int)(n);i<_n;++i)
#define ALL(v) (v).begin(),(v).end()
template<class T1,class T2>ostream& operator<<(ostream& os,const pair<T1,T2>&a){return os<<"("<<a.first<<","<<a.second<< ")";}
template<class T>void pv(T a,T b){for(T i=a;i!=b;++i)cout<<(*i)<<" ";cout<<endl;}
template<class T>bool chmin(T&a,const T&b){return a>b?(a=b,1):0;}
template<class T>bool chmax(T&a,const T&b){return a<b?(a=b,1):0;}


int nextInt() { int x; scanf("%d", &x); return x;}

char get(string s, int p) {
  if (0 <= p && p < s.size()) {
    return s[p];
  }
  return ' ';
}

int main2() {
  string s; 
  cin >> s;
  int N = (int)s.size();


  int ans = 0;

  REP(c, N) {
    int here = 1;
    for (int i = 1; i <= N; i++) {
      char a = get(s, c + i);
      char b = get(s, c - i);
      if (a != ' ' && b != ' ' && a == b) {
        here += 2;
      }
    }
    chmax(ans, here);
  }
  REP(c, N) {
    int here = 0;
    for (int i = 1; i <= N; i++) {
      char a = get(s, c + i - 1);
      char b = get(s, c - i);
      if (a != ' ' && b != ' ' && a == b) {
        here += 2;
      }
    }
    chmax(ans, here);
  }
  cout << ans << endl;
  return 0;
}

int main() {
  for (;!cin.eof();cin>>ws) main2();
  return 0;
}