Problem: As meticulous Gerald sets the table and caring Alexander sends the postcards, Sergey makes snowmen. Each showman should consist of three snowballs: a big one, a medium one and a small one. Sergey's twins help him: they've already made n snowballs with radii equal to r1, r2, ..., rn. To make a snowman, one needs any three snowballs whose radii are pairwise different. For example, the balls with radii 1, 2 and 3 can be used to make a snowman but 2, 2, 3 or 2, 2, 2 cannot. Help Sergey and his twins to determine what maximum number of snowmen they can make from those snowballs.

Input

The first line contains integer n (1 ≤ n ≤ 105) — the number of snowballs. The next line contains n integers — the balls' radii r1, r2, ..., rn (1 ≤ ri ≤ 109). The balls' radii can coincide.

Output

Print on the first line a single number k — the maximum number of the snowmen. Next k lines should contain the snowmen's descriptions. The description of each snowman should consist of three space-separated numbers — the big ball's radius, the medium ball's radius and the small ball's radius. It is allowed to print the snowmen in any order. If there are several solutions, print any of them.

Examples

Input

7
1 2 3 4 5 6 7


Output

2
3 2 1
6 5 4


Input

3
2 2 3


Output

0

Solution (in JAVA):

Solution:
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Locale;
import java.util.StringTokenizer;
import java.util.TreeMap;

public class C {
	private static final String TASKNAME = "c";

	private void solve() throws IOException {
		int n = nextInt();
		int[] a = new int[n];
		for (int i = 0; i < n; ++i) {
			a[i] = nextInt();
		}
		Arrays.sort(a);

		int l = 1;
		int r = n / 3;
		int val = 0;
		while (l <= r) {
			int med = (l + r) / 2;
			if (getAns(med, a) != null) {
				val = med;
				l = med + 1;
			} else {
				r = med - 1;
			}
		}

		int[] ans = getAns(val, a);
		println(val);
		for (int i = 0; i < val; ++i) {
			for (int j = 2; j >= 0; --j) {
				print(ans[i * 3 + j] + " ");
			}
			println("");
		}
	}

	private int[] getAns(int size, int[] a) {
		int[] ans = new int[size * 3];
		for (int i = 0; i < size; ++i) {
			ans[i * 3] = a[i];
		}
		int p = size;
		for (int i = 0; i < 2; ++i) {
			for (int j = 0; j < size; ++j) {
				while (p < a.length && a[p] == ans[j * 3 + i]) {
					++p;
				}
				if (p == a.length) {
					return null;
				}
				ans[j * 3 + i + 1] = a[p++];
 			}
		}
		return ans;
	}

	private void run() {
		try {
			reader = new BufferedReader(new InputStreamReader(System.in));
			writer = new PrintWriter(new OutputStreamWriter(System.out));
//			 reader = new BufferedReader(new FileReader(TASKNAME + ".in")	);
			// writer = new PrintWriter(TASKNAME + ".out");

			solve();

			reader.close();
			writer.close();
		} catch (IOException e) {
			e.printStackTrace();
			System.exit(13);
		}
	}

	public static void main(String[] args) {
		long time = System.currentTimeMillis();
		Locale.setDefault(Locale.US);
		new C().run();
		System.err.printf("%.3f\n", 1e-3 * (System.currentTimeMillis() - time));
	}

	private BufferedReader reader;
	private PrintWriter writer;
	private StringTokenizer tokenizer;

	private String nextToken() throws IOException {
		while (tokenizer == null || !tokenizer.hasMoreTokens()) {
			tokenizer = new StringTokenizer(reader.readLine());
		}
		return tokenizer.nextToken();
	}

	private int nextInt() throws NumberFormatException, IOException {
		return Integer.parseInt(nextToken());
	}

	private double nextDouble() throws NumberFormatException, IOException {
		return Double.parseDouble(nextToken());
	}

	private long nextLong() throws NumberFormatException, IOException {
		return Long.parseLong(nextToken());
	}

	private void print(Object o) {
		writer.print(o);
	}

	private void println(Object o) {
		writer.println(o);
	}

	private void printf(String format, Object... o) {
		writer.printf(format, o);
	}
}