#include <iostream>
#include <cstdio>
#include <cstring>

using namespace std;

char cuv[2000010];
int lp[2000010],centru,dr,lgmax,contor,lg,suma;

void citire()
{
    cin.getline(cuv,1000005);
    lg=strlen(cuv);
    contor=lg;
    lg=2*lg+1;
}

void cel_mai_lung()
{
    lp[1]=1;
    if(lg==0)
        return;
    for(int i=2; i<lg; i++)
    {
        if(dr-i>0)
            lp[i]=min(lp[2*centru-i],dr-i);
        while(((i+lp[i])<lg&&(i-lp[i])>0) &&
                (((i+lp[i]+1)%2==0) ||
                 (cuv[(i+lp[i]+1)/2]==cuv[(i-lp[i]-1)/2])))
        {
            lp[i]++;
            if((i+lp[i])%2!=0)
                contor++;
        }
        if(lp[i]>lgmax)
        {
            lgmax=lp[i];
            //maxLPSCenterPosition = i;
        }
        if (i+lp[i]>dr)
        {
            centru=i;
            dr=i+lp[i];
        }
    }
}

void afisare()
{
    for(int i=1; i<lg; i+=2)
        suma+=lp[i];
}

int main()
{
    freopen("pscpld.in","r",stdin);
    freopen("pscpld.out","w",stdout);
    citire();
    cel_mai_lung();
    afisare();
    cout<<suma;
    return 0;
}