Problem: You are given a square matrix consisting of n rows and n columns. We assume that the rows are numbered from 1 to n from top to bottom and the columns are numbered from 1 to n from left to right. Some cells (n - 1 cells in total) of the the matrix are filled with ones, the remaining cells are filled with zeros. We can apply the following operations to the matrix:

  1. Swap i-th and j-th rows of the matrix; 
  2. Swap i-th and j-th columns of the matrix. 



You are asked to transform the matrix into a special form using these operations. In that special form all the ones must be in the cells that lie below the main diagonal. Cell of the matrix, which is located on the intersection of the i-th row and of the j-th column, lies below the main diagonal if i > j.

Input

The first line contains an integer n (2 ≤ n ≤ 1000) — the number of rows and columns. Then follow n - 1 lines that contain one's positions, one per line. Each position is described by two integers xk, yk (1 ≤ xk, yk ≤ n), separated by a space. A pair (xk, yk) means that the cell, which is located on the intersection of the xk-th row and of the yk-th column, contains one.

It is guaranteed that all positions are distinct.

Output

Print the description of your actions. These actions should transform the matrix to the described special form.

In the first line you should print a non-negative integer m (m ≤ 105) — the number of actions. In each of the next m lines print three space-separated integers t, i, j (1 ≤ t ≤ 2, 1 ≤ i, j ≤ n, i ≠ j), where t = 1 if you want to swap rows, t = 2 if you want to swap columns, and i and j denote the numbers of rows or columns respectively.

Please note, that you do not need to minimize the number of operations, but their number should not exceed 105. If there are several solutions, you may print any of them.

Examples

Input

2
1 2


Output

2
2 1 2
1 1 2


Input

3
3 1
1 3


Output

3
2 2 3
1 1 3
1 1 2


Input

3
2 1
3 2


Output

0

Solution (in JAVA):

Solution:
import java.io.OutputStreamWriter;
import java.io.BufferedWriter;
import java.util.Locale;
import java.io.OutputStream;
import java.util.RandomAccess;
import java.io.PrintWriter;
import java.util.AbstractList;
import java.io.Writer;
import java.util.List;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.ArrayList;
import java.math.BigInteger;
import java.util.Collections;
import java.io.InputStream;

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

class TaskC {

    private int[] x;
    private int n;
    private int[] y;
    private int[] rowCount;
    private int[] colCount;
    List<String> answer = new ArrayList<String>();

    public void solve(int testNumber, InputReader in, OutputWriter out) {
        n = in.nextInt();
        x = new int[n - 1];
        y = new int[n - 1];
        ArrayUtils.readIntArrays(in, x, y);
        rowCount = new int[n + 1];
        colCount = new int[n + 1];
        for (int i = 0; i < x.length; i++) {
            rowCount[x[i]]++;
            colCount[y[i]]++;
        }
        while (n > 1) {
            int toChangeCol = -1;
            for (int j = 1; j <= n; j++) {
                if (colCount[j] == 0) {
                    toChangeCol = j;
                }
            }
            if (toChangeCol == -1)
                throw new RuntimeException();
            if (toChangeCol != n) {
                changeCol(toChangeCol, n);
            }
            for (int i = 0; i < x.length; i++) {
                if (y[i] == n)
                    rowCount[x[i]]--;
            }
            int toChangeRow = -1;
            for (int i = 1; i <= n; i++) {
                if (rowCount[i] != 0) {
                    toChangeRow = i;
                }
            }
            if (toChangeRow == -1)
                break;
            if (toChangeRow != n) {
                changeRow(toChangeRow, n);
            }
            for (int i = 0; i < x.length; i++) {
                if (x[i] == n)
                    colCount[y[i]]--;
            }
            n--;
        }
        out.println(answer.size());
        for (String s : answer) {
            out.println(s);
        }
    }

    private void changeRow(int a, int b) {
        for (int i = 0; i < x.length; i++) {
            if (x[i] == b)
                x[i] = a;
            else if (x[i] == a)
                x[i] = b;
        }
        int tmp = rowCount[a];
        rowCount[a] = rowCount[b];
        rowCount[b] = tmp;
        answer.add("1 " + a + " " + b);
    }

    private void changeCol(int a, int b) {
        for (int i = 0; i < x.length; i++) {
            if (y[i] == b)
                y[i] = a;
            else if (y[i] == a)
                y[i] = b;
        }
        int tmp = colCount[a];
        colCount[a] = colCount[b];
        colCount[b] = tmp;
        answer.add("2 " + a + " " + b);
    }


}

class InputReader {

    private InputStream stream;
    private byte[] buf = new byte[1 << 16];
    private int curChar;
    private int numChars;

    public InputReader(InputStream stream) {
        this.stream = stream;
    }

    public int read() {
        if (numChars == -1)
            throw new InputMismatchException();
        if (curChar >= numChars) {
            curChar = 0;
            try {
                numChars = stream.read(buf);
            } catch (IOException e) {
                throw new InputMismatchException();
            }
            if (numChars <= 0)
                return -1;
        }
        return buf[curChar++];
    }

    public int nextInt() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        int res = 0;
        do {
            if (c < '0' || c > '9')
                throw new InputMismatchException();
            res *= 10;
            res += c & 15;
            c = read();
        } while (!isSpaceChar(c));
        return res * sgn;
    }

    public static boolean isSpaceChar(int c) {
        return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
    }

    }

class OutputWriter {
    private PrintWriter writer;

    public OutputWriter(OutputStream stream) {
        writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(stream)));
    }

    public OutputWriter(Writer writer) {
        this.writer = new PrintWriter(writer);
    }

    public void println(int i) {
        writer.println(i);
    }

    public void println(String x) {
        writer.println(x);
    }

    public void close() {
        writer.close();
    }

    }

class ArrayUtils {

    public static void readIntArrays(InputReader in, int[]... arrays) {
        for (int i = 0; i < arrays[0].length; i++) {
            for (int j = 0; j < arrays.length; j++) {
                arrays[j][i] = in.nextInt();
            }
        }
    }



    }