#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;

int d[2000010];
char sir[2000010];

int main()
{
    freopen("pscpld.in", "r", stdin);
    freopen("pscpld.out", "w", stdout);
    scanf("%s",sir+1);
    int n=strlen(sir+1),nr=2*n,mid=0,lim=0;
    long long sol=0;
    for(int i=n;i;i--)
    {
        sir[nr--]=sir[i];
        sir[nr--]='*';
    }
    n=2*n+1;
    sir[n]='*';
    for(int i=1;i<=n;i++)
    {
        if(i<=lim) d[i]=min(lim-i,d[2*mid-i]);
        while(1<=i-d[i]-1 && i+d[i]+1<=n && sir[i-d[i]-1]==sir[i+d[i]+1]) d[i]++;
        if(i+d[i]>lim) {mid=i;lim=i+d[i];}
    }
    for(int i=1;i<=n;i++) sol+=(d[i]+1)/2;
    printf("%lld",sol);
    return 0;
}