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

#define pii pair<int, int>
#define int long long
#define endl "\n"

inline int read() {
	int x = 0, F = 1;
	char ch = getchar();
	while (ch < '0' || ch > '9') {
		if (ch == '-') F = -1;
		ch = getchar();
	}
	while (ch >= '0' && ch <= '9') x = x * 10 + ch - '0',ch = getchar();
	return x * F;
}

void write(int x) {
	if (x < 0) putchar('-'), x = -x;
	if (x > 9) write(x / 10);
	putchar(x % 10 + '0');
	return;
}

signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int T;
	cin >> T;
	while (T--) {
		int n;
		cin >> n;
		if (n == 1) cout << -1;
		else if (n == 2) cout << "1";
		else if (n == 3) cout << "7";
		else if (n == 4) cout << "4";
		else if (n == 5) cout << "2";
		else if (n == 6) cout << "6";
		else if (n == 7) cout << "8";
		else {
			if (n % 7 == 0) {for (int i = 1; i <= n / 7; ++i) cout << "8";}
			else if (n % 7 == 1) {cout << "10"; for (int i = 1; i <= ((n - 8) / 7); ++i) cout << "8";}
			else if (n % 7 == 2) {cout << "1"; for (int i = 1; i <= ((n - 2) / 7); ++i) cout << "8";}
			else if (n % 7 == 3) {
				if (n == 10) cout << 22;
				else {cout << "200"; for (int i = 1; i <= (n - 11) / 2; ++i) cout << "8";}
			}
			else if (n % 7 == 4) {cout << "20"; for (int i = 1; i <= (n - 11) / 7; ++i) cout << "8";}
			else if (n % 7 == 5) {cout << "2"; for (int i = 1; i <= (n - 5) / 7; ++i) cout << "8";}
			else if (n % 7 == 6) {cout << "6"; for (int i = 1; i <= (n - 6) / 7; ++i) cout << "8";}
		}
		cout << endl;
	}
	return 0;
}