#include <iostream>
#include <cstdio>
#include <cstring>
#define NMAX 1000005
#define LMAX 4 * NMAX

using namespace std;

char tmp[NMAX];
char sirInit[NMAX];
int l=1, i1;
int lps[LMAX];
int st, dr, c;
int rez;

void print()
{
    for(int i=1; i<strlen(sirInit); i++)
    {
        if(lps[i] % 2 == 0)
            rez += lps[i] / 2;
        else
            rez += lps[i] / 2 +1;
    }
    printf("%d",rez);
}

void solve()
{
    lps[0] = 0;
    lps[1] = 1;
    c = 1, dr=2, i1;
    int s, d;
    for (int i=2; i<strlen(sirInit); ++i)
    {
        i1 = 2 * c - i;
        if (i < dr)
            lps[i] = min(lps[i1], dr - i);
        else if (i >= dr)
            lps[i] = 0;
        st = i-1, dr = i + 1;
        while (sirInit[st] == sirInit[dr])
        {
            st--, dr++;
            lps[i]++;
        }
        if (i + lps[i] > dr)
        {
            dr = i + lps[i];
            c = i;
        }

    }


}

void prelucrare()
{
    sirInit[0] = '#';
    for (int i=0; i<strlen(tmp); ++i)
    {
        sirInit[l] = tmp[i];
        sirInit[l+1] = '#';
        l+=2;
    }
}

int main()
{
    freopen("pscpld.in", "r", stdin);
    freopen("pscpld.out", "w", stdout);
    gets(tmp);
    prelucrare();
    solve();
    print();
    return 0;
}