#include <fstream>
#include <cstring>
#define NMAX 1000005

using namespace std;

int n,sol,i2,st,dr;
int p[NMAX*2];
char s[NMAX],v[NMAX*2];

void extinde(int poz)
{
    while(poz - p[poz] > 0 && poz + p[poz] <= n && v[poz - p[poz]] == v[poz + p[poz]]) ++p[poz];
     --p[poz];
}

int main()
{
    ifstream f("pscpld.in");
    ofstream g("pscpld.out");
    f.getline(s+1,NMAX);

    n = strlen(s+1);
    for(int i = n; i >= 0; --i)
    {
        v[2*i]=s[i];
        v[2*i+1]='#';
    }

    int c = 1;
    n = n * 2 +1;
    for(int i = 2; i <= n; ++i)
    {
        i2 = 2 * c - i;
        st = c - p[c];
        dr = c + p[c];
        if (i > dr)
        {
            extinde(i);
            c = i;
        }
        else
        {
            if (i2 - p[i2] > st)
            {
                p[i] = p[i2];
            }
            else
            {
                p[i] = dr - i;
                extinde(i);
                c = i;
            }
        }
    }

    for(int i = 1; i <= n; ++i)
        sol += (p[i]/2);
    sol += (n/2);
    g<<sol<<"\n";
}