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

using namespace std;

int U[101];

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

int ucif(int n)///ultima cifra a lui n^n
{
    int uc = n % 10, r = n % 4, p = 1;
    if (r == 0)
        r = 4;
    while (r--)
        p *= uc;
    return p % 10;
}
void test()
{
    int s = 0;
    for (int i = 1; i <= 45; i++)
        s += ucif(i);
    cout << s % 10; ///s=>0
}
void precalcul()
{
    U[0] = 0;
    for (int i = 1; i < 100; i++)
        U[i] = (U[i - 1] + ucif(i)) % 10;
}
int main()
{
    int T, ncif, rest;
    char sir[101];
    precalcul();
    f >> T;
    while (T--)
    {
        f >> sir;
        ncif = strlen(sir);
        rest = sir[ncif - 1] - '0';
        if (ncif >= 2)
            rest += (sir[ncif - 2] - '0') * 10;
        g << U[rest] << '\n';
    }


    return 0;
}