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

int main() {
	string s; cin >> s;
	string t = "";
	set<string> st;
	auto dfs = [&](auto self, int l, int r) -> void {
		if (l == r) {
			st.insert(t);
			return;
		}

		t += s[l];
		self(self, l+1, r);
		t.pop_back();

		t += s[r-1];
		self(self, l, r-1);
		t.pop_back();
	};

	dfs(dfs, 0, (int)s.size());
	cout << (int)st.size() << endl;
}