#include <cstring>
#include <fstream>

using namespace std;

const int SIZE = 100;

ifstream fin("cifra.in");
ofstream fout("cifra.out");

inline int power(int x, int y)
{
    if (y == 0) return 1;
    return (x * (power(x, y - 1) % 10)) % 10;
}

void PreGen();
void Read();
void Solve();
void Write();

char n[SIZE + 1];
int t, real, pg[SIZE + 1];

int main()
{
    PreGen();
    Read();
}

void PreGen()
{
    for (int i = 1; i < SIZE; ++i)
    {
        pg[i] = pg[i - 1] + power(i, i);
        pg[i] %= 10;
    }
}

void Read()
{
    fin >> t;

    fin.getline(n, SIZE);
    while (t--)
    {
        fin.getline(n, SIZE);
        Solve();
        Write();
    }
}

void Solve()
{
    int len = strlen(n);
    if (len > 1)
        real = (n[len - 2] - '0') * 10 + n[len - 1] - '0';
    else
        real = n[len - 1] - '0';
}

void Write()
{
    fout << pg[real] << '\n';
}