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.util.List;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.ArrayList;
import java.io.BufferedReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskC solver = new TaskC();
		solver.solve(1, in, out);
		out.close();
	}
}

class TaskC {
	public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        int[] r = new int[n];
        for (int i = 0; i < n; ++i) {
            r[i] = in.nextInt();
        }
        Arrays.sort(r);
        int[] what = new int[n];
        int[] count = new int[n];
        int cnt = 0;
        for (int i = 0; i < n; ++i) {
            if (i == 0 || r[i] != r[i - 1]) {
                what[cnt] = r[i];
                count[cnt] = 1;
                ++cnt;
            } else ++count[cnt - 1];
        }
        int[] next = new int[n + n + 1];
        int[] prev = new int[n + n + 1];
        for (int i = 0; i <= n; ++i) {
            next[i + n] = i + n;
            prev[i + n] = i + n;
        }
        for (int i = 0; i < cnt; ++i) {
            prev[i] = count[i] + n;
            next[i] = next[count[i] + n];
            prev[next[i]] = i;
            next[prev[i]] = i;
        }
        int[] nextNonEmpty = new int[n + 2];
        int[] prevNonEmpty = new int[n + 2];
        nextNonEmpty[n + 1] = n + 1;
        prevNonEmpty[n + 1] = n + 1;
        for (int i = 0; i <= n; ++i)
            if (next[i + n] != i + n) {
                prevNonEmpty[i] = n + 1;
                nextNonEmpty[i] = nextNonEmpty[n + 1];
                prevNonEmpty[nextNonEmpty[i]] = i;
                nextNonEmpty[prevNonEmpty[i]] = i;
            }
        List<String> res = new ArrayList<String>();
        int[] cur = new int[3];
        while (true) {
            int tmp = nextNonEmpty[n + 1];
            boolean ok = true;
            int tmpPos = tmp + n;
            for (int i = 0; i < 3; ++i) {
                if (tmp == 0 || tmp == n + 1) {
                    ok = false;
                    break;
                }
                tmpPos = next[tmpPos];
                if (tmpPos == tmp + n) {
                    tmp = nextNonEmpty[tmp];
                    if (tmp == 0 || tmp == n + 1) {
                        ok = false;
                        break;
                    }
                    tmpPos = next[tmp + n];
                    if (tmpPos == tmp + n) throw new RuntimeException();
                }
                cur[i] = tmpPos;
            }
            if (!ok) break;
            Arrays.sort(cur);
            res.add((what[cur[2]]) + " " + (what[cur[1]]) + " " + (what[cur[0]]));
            for (int i = 0; i < 3; ++i) {
                int x = cur[i];
                int y = count[x];
                next[prev[x]] = next[x];
                prev[next[x]] = prev[x];
                next[x] = next[y - 1 + n];
                prev[x] = y - 1 + n;
                next[prev[x]] = x;
                prev[next[x]] = x;
                if (next[x] == prev[x]) {
                    nextNonEmpty[y - 1] = nextNonEmpty[y];
                    prevNonEmpty[y - 1] = y;
                    nextNonEmpty[prevNonEmpty[y - 1]] = y - 1;
                    prevNonEmpty[nextNonEmpty[y - 1]] = y - 1;
                }
                if (next[y + n] == y + n) {
                    nextNonEmpty[prevNonEmpty[y]] = nextNonEmpty[y];
                    prevNonEmpty[nextNonEmpty[y]] = prevNonEmpty[y];
                }
                count[x] = y - 1;
            }
        }
        out.println(res.size());
        for (String x : res) {
            out.println(x);
        }
	}
}

class InputReader {
    private BufferedReader reader;
    private StringTokenizer tokenizer;

    public InputReader(InputStream stream) {
        reader = new BufferedReader(new InputStreamReader(stream));
        tokenizer = null;
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }

    public int nextInt() {
        return Integer.parseInt(next());
    }

    }