#include <iostream>
#include <limits.h>
#include <cmath>
#include <string>
#include <stdio.h>
#include <algorithm>
#include <stdlib.h>
#include <vector>
#include <stack>
#include <map>
#include <fstream>
#include <list>
#include <queue>
#include <cstring>
#include <iomanip>
#include <deque>
#include <set>

using namespace std;

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


int sp1[] = {0,1,5,2,8,3,9,2,8,7};
int sp2[] = {0,1,7,0,6,1,7,4,8,7};

int main()
{
    int t;
    char x[105];
    f>>t;

    f.get();
    for(int i = 1; i<=t; i++)
    {
        f.getline(x,105);

        int l = strlen(x);

        if (l == 1)
        {
            g<<sp1[x[0]-'0']<<"\n";
        }
        else
        {
            int unitati = x[l-1] - '0';
            int zeci = x[l-2] - '0';

            if (zeci % 2 == 0)
                g<<((zeci * 47) + sp1[unitati])%10<<"\n";
            else
                g<<((zeci * 47) + sp2[unitati])%10<<"\n";

        }
    }

    return 0;
}