#include <cstdio>
#include <cstring>

using namespace std;

int T;
char N[102];
int result[101]; // retine toate raspunsurile pentru N <= 100; peste 100, se repeta

// precalculeaza toate posibilitatile de sume (se repeta dupa N = 100)
void computeResults() {
    int n;

    for (int i = 1; i <= 100; i++) {
        n = 1;

        for (int j = 1; j <= i; j++) {
            n = (n * (i % 10)) % 10;
        }
        result[i] = (result[i - 1] + n) % 10;
    }
}

int main() {
    freopen("cifra.in", "r", stdin);
    freopen("cifra.out", "w", stdout);

    computeResults();
    scanf("%d", &T);

    for (int i = 1; i <= T; i++) {
        scanf("%s", &N);

        int length = strlen(N);
        int index = N[length - 1] - '0';

        if (length > 1) {
            index = (N[length - 2] - '0') * 10 + index;
        }

        printf("%d\n", result[index]);
    }
}