#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;
const int NMAX = 100;

int T;
int v[NMAX];
char s[NMAX + 1];

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

int calc_cif(int n)
{
    int p = n % 4, rez = 1, uc = n % 10;
    if(p == 0) p = 4;
    while(p--)
        rez *= uc;
    return rez % 10;
}

void precalc()
{
    for(int i = 1; i < NMAX; i++)
        v[i] = (v[i - 1] + calc_cif(i)) % 10;
}

int main()
{
    precalc();
    f >> T;
    for(int i = 1; i <= T; i++)
    {
        f >> s;
        int n = strlen(s);
        int calc = s[n - 1] - '0';
        if(n >= 2)
            calc = calc + (s[n - 2] - '0') * 10;
        g << v[calc] << '\n';
    }
    f.close();
    g.close();
    return 0;
}