#include <bits/stdc++.h>

using namespace std;

ifstream in("pscpld.in");
ofstream out("pscpld.out");

int mana[2*1000005];

int main()
{
    string s;
    char c;
    while(in>>c)
    {
        s+=c;
        s+='$';
    }
    return 0;
    int dr,mid;
    dr=mid=-1;
    int rez=s.size()/2;
    for(int i=0;i<s.size();i++)
    {
        if(i<=dr)mana[i]=min(mana[2*mid-1],dr-i);
        while(s[i+mana[i]+1]==s[i-mana[i]-1])mana[i]++;
        if(i+mana[i]>dr)
        {
            mid=i;
            dr=i+mana[i];
        }
        rez+=mana[i]/2;
    }
    out<<rez;
}