#include <cstdio>
#include <cstring>

long long cit() {
    long long ans = 0;
    char c = getchar();
    bool neg = false;
    while (c < '0' || c > '9') {
        if (c == '-') {
            c = getchar();
            neg = true;
            break;
        }
        c = getchar();
    }
    while (c >= '0' && c <= '9') {
        ans = (ans << 3) + (ans << 1) + (c - '0');
        c = getchar();
    }
    return (neg) ? -ans : ans;
}

void afis(long long n) {
    int l = 0;
    char c[20];
    if (n == 0) {
        putchar('0');
    }
    if (n < 0) {
        putchar('-');
        n = -n;
    }
    while (n > 0) {
        c[l++] = n % 10 + '0';
        n /= 10;
    }
    for (int i = l - 1; i >= 0; i--) {
        putchar(c[i]);
    }
    putchar('\n');
}

int f(int n) {
    int b = n, e = n, m = 10;
    int ans = 1;
    b = b % m;
    while (e > 0) {
        if (e % 2 == 1) {
            ans = (ans * b) % m;
        }
        b = (b * b) % m;
        e >>= 1;
    }
    return ans;
}
int main() {
    freopen("fact.in", "r", stdin);
    freopen("fact.out", "w", stdout);

    int ans[100];
    ans[0] = 0;
    for (int i = 1; i < 100; i++) {
        ans[i] = (ans[i - 1] + f(i)) % 10;
    }

    int t = cit();
    for (int i = 0; i < t; i++) {
        char sir[100];
        gets(sir);
        int l = strlen(sir);
        if (l > 1) {
            afis(ans[10 * (sir[l - 2] - '0') + sir[l - 1] -'0']);
        } else {
            afis(ans[sir[l - 1] - '0']);
        }
    }
    return 0;
}