#include <iostream>
#include <string>
#include <set>
#include <functional>

int main(){
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    
    std::string input;
    std::cin >> input;
    std::set<std::string> generatedStr;
    
    std::function<void(int, int, std::string)> Calc = [&](int i, int j, std::string str){
        if(i==j){
            generatedStr.insert(str+input[i]);
        }else{
            Calc(i+1, j, str+input[i]);
            Calc(i, j-1, str+input[j]);
        }
    };
    Calc(0, input.size()-1, "");
    
    std::cout << generatedStr.size() << "\n";
    return 0;
}