#include <fstream>
#include <vector>
using namespace std;

#define NMAX 1000001

char c[NMAX];
int k = 0, s = 0;
vector <int> v[52];
int main()
{
    ifstream fin("unic.in");
    ofstream fout("unic.out");

    fin >> c;

    for (k = 0; k < NMAX && c[k] != '\0'; k++)
    {
        int nom = (int)c[k] < 97 ? (int) c[k] - 65 : (int) c[k] - 71;
        v[nom].push_back(k);
    }
    for (int i = 0; i < 52; i++)
    {
        if (v[i].size() == 1)
            s += (1<<)
    }
    return 0;
}