#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <deque>
#include <stack>
#define tmax 30005
using namespace std;

int main() {
	ifstream f("cifra.in");
	ofstream g("cifra.out");

	int test, t, i, j, nr, a, b, lung, sol;
	string s;
	short v[] = { 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 } ;

    f>>t; f.get();
	for(test=1; test<=t; test++) {
	    getline(f,s);

	    lung = s.length();
	    a = 0;

	    b = int(s[lung-1]) - 48;
        if(lung > 1) a = int(s[lung-2]) - 48;

        nr =  b;
        sol = 7 * a;

        sol = v[nr];


        //cout<<nr<<"\n";

        g<<sol%10<<"\n";
	}

	return 0;
}