#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i < n; i++)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;

int main() {
    string s;
    cin >> s;
    set<string> st;
    auto f = [&](auto f, string now, int l, int r) -> void {
        if (l == r) {
            st.insert(now);
            return;
        }
        f(f, now + s[l], l + 1, r);
        f(f, now + s[r - 1], l, r - 1);
    };
    f(f, "", 0, (int)s.size());
    cout << st.size() << endl;
}