#include <stdio.h>
#include <string.h>

char in[1000100];
int x[2000100], sol[2000100];

int main() {
    freopen("pscpld.in", "r", stdin);
    freopen("pscpld.out", "w", stdout);

    gets(in + 1);
    int i, N = strlen(in + 1);

    for (i = 1; i <= N; ++i)
        x[2 * i] = in[i] - 'a' + 1;
    N = 2 * N + 1; x[0] = -1; x[N + 1] = -2;

    int center = -1000, right = -1000;
    for (i = 1; i <= N; ++i) {
        int st, dr;

        st = dr = i;
        if (i > right)
            ///sol[i] = (i % 2 == 0) ? 1 : 0;
            sol[i]=0;
        else {
            int radius = i - center;
            sol[i] = sol[center - radius];
            if (i + sol[i] > right)
                sol[i] = right - i;
            st = st - sol[i]; dr = dr + sol[i];
        }
        while (x[st-1] == x[dr+1]) {
            --st; ++dr;
            ///if (x[st] > 0 && x[st] == x[dr])
                ++sol[i];
        }
        if (dr > right)
            right = dr, center = i;
    }

    long long stot = 0;
    for (i = 1; i <= N; ++i)
        stot += (sol[i]+1)/2;
    printf("%lld", stot);

    return 0;
}