#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cifra.in");
ofstream out("cifra.out");

int u[] = {0, 1, 5, 2, 8, 3, 9, 2, 8, 7, 7,
8, 4, 7, 3, 8, 4, 1, 5, 4, 4, 5, 9, 6, 2,
7, 3, 6, 2, 1, 1, 2, 8, 1, 7, 2, 8, 5, 9,
8, 8, 9, 3, 0, 6, 1, 7, 0, 6, 5, 5, 6, 2,
5, 1, 6, 2, 9, 3, 2, 2, 3, 7, 4, 0, 5, 1,
4, 0, 9, 9, 0, 6, 9, 5, 0, 6, 3, 7, 6, 6,
7, 1, 8, 4, 9, 5, 8, 4, 3, 3, 4, 0, 3, 9,
4, 0, 7, 1, 0, 0};

int main() {
        string s;
        int t, n;
        in >> t;

        in.ignore();
        for (int i = 1; i <= t; i++) {
                getline(in, s);
                n = s.size() - 1;
                if (n > 0)
                        out << u[(s[n - 1] - '0') * 10 + (s[n] - '0')] % 10 << "\n";
                else
                        out << u[s[n] - '0'] << "\n";
        }
        return 0;
}