#include <bits/stdc++.h>
using namespace std;
vector<int> Z(const string& s) {
int n = s.size();
vector<int> z(n);
int x = 0, y = 0;
for (int i = 1; i < n; i++) {
z[i] = max(0, min(z[i-x], y-i+1));
while (i+z[i] < n && s[z[i]] == s[i+z[i]]) {
x = i; y = i+z[i]; z[i]++;
}
}
return z;
}
bool pal(const string& s) {
string t = s;
reverse(t.begin(), t.end());
return s == t;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
//freopen("palindrome.in", "r", stdin);
//freopen("palindrome.out", "w", stdout);
string s;
cin >> s;
int n = s.length();
long long res = 0;
for (int i = 0; i < n; i++) {
for (int j = i; j < n; j++) {
long long len = j - i + 1;
string t = s.substr(i, len);
if (!pal(t)) {
continue;
}
t += '#';
t += s;
vector<int> z = Z(t);
long long ans = 0;
for (int c : z) {
if (c == len) {
ans++;
}
}
ans *= len;
res = max(res, ans);
}
}
cout << res << '\n';
return 0;
}
