#include <bits/stdc++.h> using namespace std; #define lp(i, a, b) for (int i = (int)(a); i < (int)(b); i++) #define rep(i, n) lp(i, 0, n) #define rlp(i, a, b) for (int i = (int)(b) - 1; i >= (int)(a); i--) #define rrep(i, n) rlp(i, 0, n) #define mp make_pair #define mt make_tuple #define pb push_back #define eb emplace_back #define all(c) begin(c), end(c) typedef long long ll; typedef unsigned long long ull; template<typename T> inline bool chmin(T &a, T b){ if (a <= b) return false; a = b; return true; } template<typename T> inline bool chmax(T &a, T b){ if (a >= b) return false; a = b; return true; } template<typename T> inline void unique(T &c){ sort(all(c)); c.erase(unique(all(c)), end(c)); } string s; set<string> st; void dfs(string t, int x, int y) { if (x > y){ st.insert(t); return; } dfs(t + s[x], x + 1, y); dfs(t + s[y], x, y - 1); } int main() { cin >> s; dfs("", 0, s.size() - 1); cout << st.size() << endl; }