#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    string s; cin >> s;

    set<string> S;
    string now = "";
    auto dfs = [&](auto dfs,int l,int r) -> void {
        if(l == r){S.insert(now); return;}
        now += s.at(l);
        dfs(dfs,l+1,r);
        now.pop_back();
        now += s.at(r-1);
        dfs(dfs,l,r-1);
        now.pop_back();
    };
    dfs(dfs,0,s.size());

    cout << S.size() << endl;
}