#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
#define all(v) begin(v), end(v)
#define al(v, l, r) begin(v) + l, begin(v) + r + 1
#define sz(v) static_cast<int>(v.size())
#define pb push_back
#define pob pop_back
#define fs first
#define sd second

constexpr int inf = 2e9;
constexpr ll infll = 4e18;

inline int pwr(int b, int e) {
    int r = 1;

    while (e) {
        if (e & 1) {
            r = (r * b) % 10;
        }

        b = (b * b) % 10;
        e >>= 1;
    }

    return r;
}

int pref[105];

inline void solve() {
    string s;
    cin >> s;
    int n = s.back() - '0';
    s.pob();

    if (!s.empty()) {
        n += 10 * (s.back() - '0');
    }

    cout << pref[n] << "\n";
}

signed main() {
    ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    freopen("cifra.in", "r", stdin);
    freopen("cifra.out", "w", stdout);

    for (int i = 1; i < 100; ++i) {
        pref[i] = (pref[i - 1] + pwr(i, i)) % 10;
    }

    int t = 1;
    cin >> t;

    do {
        solve();
    } while (--t);
}