Problem: One day Vasya came up to the blackboard and wrote out n distinct integers from 1 to n in some order in a circle. Then he drew arcs to join the pairs of integers (a, b) (a ≠ b), that are either each other's immediate neighbors in the circle, or there is number c, such that a and с are immediate neighbors, and b and c are immediate neighbors. As you can easily deduce, in the end Vasya drew 2·n arcs.

For example, if the numbers are written in the circle in the order 1, 2, 3, 4, 5 (in the clockwise direction), then the arcs will join pairs of integers (1, 2), (2, 3), (3, 4), (4, 5), (5, 1), (1, 3), (2, 4), (3, 5), (4, 1) and (5, 2).

Much time has passed ever since, the numbers we wiped off the blackboard long ago, but recently Vasya has found a piece of paper with 2·n written pairs of integers that were joined with the arcs on the board. Vasya asks you to find the order of numbers in the circle by these pairs.

Input

The first line of the input contains a single integer n (5 ≤ n ≤ 105) that shows, how many numbers were written on the board. Next 2·n lines contain pairs of integers ai, bi (1 ≤ ai, bi ≤ n, ai ≠ bi) — the numbers that were connected by the arcs.

It is guaranteed that no pair of integers, connected by a arc, occurs in the input more than once. The pairs of numbers and the numbers in the pairs are given in the arbitrary order.

Output

If Vasya made a mistake somewhere and there isn't any way to place numbers from 1 to n on the circle according to the statement, then print a single number "-1" (without the quotes). Otherwise, print any suitable sequence of n distinct integers from 1 to n. 

If there are multiple solutions, you are allowed to print any of them. Specifically, it doesn't matter which number you write first to describe the sequence of the order. It also doesn't matter whether you write out the numbers in the clockwise or counter-clockwise direction.

Examples

Input

5
1 2
2 3
3 4
4 5
5 1
1 3
2 4
3 5
4 1
5 2


Output

1 2 3 4 5 

Input

6
5 6
4 3
5 3
2 4
6 1
3 1
6 2
2 5
1 4
3 6
1 2
4 5


Output

1 2 4 5 3 6 

Solution (in JAVA):

Solution:
import java.io.OutputStreamWriter;
import java.io.BufferedWriter;
import java.util.Comparator;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.List;
import java.io.IOException;
import java.util.InputMismatchException;
import java.util.ArrayList;
import java.util.NoSuchElementException;
import java.math.BigInteger;
import java.util.Collections;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 * @author Nguyen Trung Hieu - vuondenthanhcong11@yahoo.com
 */
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 {
    public void solve(int testNumber, InputReader in, OutputWriter out) {
        int count = in.readInt();
        if (count == 5) {
            out.printLine("1 2 3 4 5");
            return;
        }
        int[] from = new int[count * 2];
        int[] to = new int[count * 2];
        IOUtils.readIntArrays(in, from, to);
        MiscUtils.decreaseByOne(from, to);
        int[][] graph = GraphUtils.buildSimpleGraph(count, from, to);
        for (int i = 0; i < count; i++) {
            if (graph[i].length != 4) {
                out.printLine(-1);
                return;
            }
        }
        if (count == 6) {
            int[] reverse = new int[6];
            for (int i = 0; i < 6; i++) {
                reverse[i] = 15 - i;
                for (int j : graph[i])
                    reverse[i] -= j;
            }
            int[] answer = new int[6];
            int j = 0;
            for (int i = 0; i < 6; i++) {
                if (reverse[i] > i)
                    answer[j++] = i + 1;
            }
            for (int i = 0; i < 3; i++)
                answer[i + 3] = reverse[answer[i] - 1] + 1;
            out.printLine(answer);
            return;
        }
        int[] newFrom = new int[count];
        int[] newTo = new int[count];
        int j = 0;
        for (int i = 0; i < count; i++) {
            for (int k : graph[i]) {
                if (k > i)
                    continue;
                int same = 0;
                for (int l : graph[i]) {
                    for (int m : graph[k]) {
                        if (l == m)
                            same++;
                    }
                }
//                if (same > 2) {
//                    out.printLine(-1);
//                    return;
//                }
                if (same == 2) {
                    if (j == count) {
                        out.printLine(-1);
                        return;
                    }
                    newFrom[j] = i;
                    newTo[j++] = k;
                }
            }
        }
        if (j != count) {
            out.printLine(-1);
            return;
        }
        int[][] original = graph;
        graph = GraphUtils.buildSimpleGraph(count, newFrom, newTo);
        for (int i = 0; i < count; i++) {
            if (graph[i].length != 2) {
                out.printLine(-1);
                return;
            }
        }
        boolean[] visited = new boolean[count];
        int current = 0;
        int[] answer = new int[count];
        for (int i = 0; i < count; i++) {
            answer[i] = current + 1;
            visited[current] = true;
            if (i == count - 1)
                break;
            int next;
            if (visited[graph[current][0]])
                next = graph[current][1];
            else
                next = graph[current][0];
            if (visited[next]) {
                out.printLine(-1);
                return;
            }
            current = next;
        }
        for (int i = 0; i < count; i++) {
            int next = i + 2;
            int next1 = i + 1;
            if (next >= count)
                next -= count;
            next = answer[next] - 1;
            if (next1 >= count)
                next1 -= count;
            next1 = answer[next1] - 1;
            boolean found = false;
            boolean found1 = false;
            for (int k : original[answer[i] - 1]) {
                if (k == next)
                    found = true;
                if (k == next1)
                    found1 = true;
            }
            if (!found || !found1) {
                out.printLine(-1);
                return;
            }
        }
        out.printLine(answer);
    }
}

class InputReader {
    private InputStream stream;
    private byte[] buf = new byte[1024];
    private int curChar;
    private int numChars;
    private SpaceCharFilter filter;

    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 readInt() {
        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 - '0';
            c = read();
        } while (!isSpaceChar(c));
        return res * sgn;
    }

    public boolean isSpaceChar(int c) {
        if (filter != null)
            return filter.isSpaceChar(c);
        return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
    }

    public interface SpaceCharFilter {
        public boolean isSpaceChar(int ch);
    }

    }

class OutputWriter {
    private final PrintWriter writer;

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

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

    public void print(int[] array) {
        for (int i = 0; i < array.length; i++) {
            if (i != 0)
                writer.print(' ');
            writer.print(array[i]);
        }
    }

    public void printLine(int[] array) {
        print(array);
        writer.println();
    }

    public void print(Object...objects) {
        for (int i = 0; i < objects.length; i++) {
            if (i != 0)
                writer.print(' ');
            writer.print(objects[i]);
        }
    }

    public void printLine(Object...objects) {
        print(objects);
        writer.println();
    }

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

}

class IOUtils {

    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.readInt();
        }
    }

    }

class MiscUtils {

    public static void decreaseByOne(int[]...arrays) {
        for (int[] array : arrays) {
            for (int i = 0; i < array.length; i++)
                array[i]--;
        }
    }

    }

class GraphUtils {
    public static int[][] buildGraph(int vertexCount, int[] from, int[] to) {
        int edgeCount = from.length;
        int[] degree = new int[vertexCount];
        for (int i = 0; i < edgeCount; i++) {
            degree[from[i]]++;
            degree[to[i]]++;
        }
        int[][] graph = new int[vertexCount][];
        for (int i = 0; i < vertexCount; i++)
            graph[i] = new int[degree[i]];
        for (int i = 0; i < edgeCount; i++) {
            graph[from[i]][--degree[from[i]]] = i;
            graph[to[i]][--degree[to[i]]] = i;
        }
        return graph;
    }

    public static int otherVertex(int vertex, int from, int to) {
        return from + to - vertex;
    }

    public static int[][] buildSimpleGraph(int vertexCount, int[] from, int[] to) {
        int[][] graph = buildGraph(vertexCount, from, to);
        simplifyGraph(from, to, graph);
        return graph;
    }

    private static void simplifyGraph(int[] from, int[] to, int[][] graph) {
        for (int i = 0; i < graph.length; i++) {
            for (int j = 0; j < graph[i].length; j++) {
                graph[i][j] = otherVertex(i, from[graph[i][j]], to[graph[i][j]]);
            }
        }
    }

    }