没“门”

#include <bits/stdc++.h>
using namespace std;

int a[20001] = {0};

int r[14] = {0, 0, 1, 7, 4, 2, 6, 8, 10, 18, 22, 20, 28, 68};

int main() {
	int n;
	cin >> n;

	while (n--) {
		memset(a, 0, sizeof(0));
		int x = 0;
		cin >> x;

		if (x < 2) {
			cout << "-1" << endl;
			continue;
		}

		int w = 0;

		while (1 > 0) {
			if (x == 0) {
				break;
			}

			if (x < 14) {
				if (x == 10 && w > 0) {
					a[w] = r[11];
					a[w - 1] = 0;
					break;
				}

				a[w] = r[x];
				break;
			}

			x = x - 7;
			a[w] = 8;
			w++;
		}

		for (int i = w; i >= 0; i--) {

			cout << a[i];
		}

		cout << endl;
	}

	return 0;
}