#include <bits/stdc++.h>
using namespace std;
const int f[10] = {0, -1, 1, 7, 4, 2, 6, 8, 10};
int T, n, d, i;
int main() {
    for (cin >> T; T--;) {
        cin >> n;
        if (n <= 8)
            cout << f[n];
        else {
            d = n % 7;
            if (!d)
                for (i = 1; i <= n / 7; i++) cout << 8;
            if (d == 1) {
                cout << 10;
                for (i = 1; i < n / 7; i++) cout << 8;
            }
            if (d == 2) {
                cout << 1;
                for (i = 1; i <= n / 7; i++) cout << 8;
            }
            if (d == 3) {
                if (n == 10)
                    cout << 22;
                else {
                    cout << 200;
                    for (i = 1; i <= n / 7 - 2; i++) cout << 8;
                }
            }
            if (d == 4) {
                cout << 20;
                for (i = 1; i < n / 7; i++) cout << 8;
            }
            if (d == 5) {
                cout << 2;
                for (i = 1; i <= n / 7; i++) cout << 8;
            }
            if (d == 6) {
                cout << 6;
                for (i = 1; i <= n / 7; i++) cout << 8;
            }
        }
        cout << '\n';
    }
}