#include <iostream>
#include <algorithm>
#include <string>

using namespace std;

const int64_t P = 2017;
const int64_t MOD = 1000000007;
const int MAX = 100100;

int64_t powers[MAX];
int64_t pref[MAX];
int64_t rpref[MAX];

void precalc_powers(int64_t *p, int64_t base, int64_t mod)
{
    p[0] = 1;
    for (int i = 1; i < MAX; ++i)
    {
        p[i] = p[i - 1] * base % mod;
    }
}

void precalc_hash(int64_t *a, string &line, int64_t base, int64_t mod)
{
    a[0] = 0;
    for (int i = 1; i <= line.size(); ++i)
    {
        a[i] = (a[i - 1] * base + (signed char)line[i - 1]) % mod;
    }
}

int64_t get_hash(int l, int r, int64_t *a, int64_t *pows, int64_t mod)
{
    return (a[r] - a[l] * pows[r - l] % mod + mod) % mod;
}

int main()
{
    string line;
    cin >> line;
    string rline = line;
    reverse(rline.begin(), rline.end());
    precalc_powers(powers, P, MOD);
    precalc_hash(pref, line, P, MOD);
    precalc_hash(rpref, rline, P, MOD);
    int64_t odd_max = -1;


    return 0;
}