using System;
using System.Linq;
using System.Numerics;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using N = System.Int64;

static class Program
{
    static public void Main(string[] args)
    {
        Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        var solver = new Solver();
        solver.Solve();
        Console.Out.Flush();
    }
}

public class Solver
{
    int n, m;
    List<int>[] e, re;
    int[] cmp;
    bool[] ans;
    List<int> ps;
    public void Solve()
    {
        n = ri; m = ri;
        e = new List<int>[6 * n];
        re = new List<int>[6 * n];
        for (int i = 0; i < 6 * n; i++)
        {
            e[i] = new List<int>();
            re[i] = new List<int>();
        }
        for (int i = 0; i < n; i++)
        {
            for (int j = 0; j < 3; j++)
            {
                add_edge(i + j * n, i + ((j + 1) % 3 + 3) * n);
                add_edge(i + j * n, i + ((j + 2) % 3 + 3) * n);
            }
        }
        for (int i = 0; i < m; i++)
        {
            int p = ri - 1, q = ri - 1, a = ri - 1, b = ri - 1;
            add_edge(p + (a + 3) * n, q + b * n);
            add_edge(q + (b + 3) * n, p + a * n);
        }
        cmp = new int[6 * n];
        ps = new List<int>();
        for (int i = 0; i < 6 * n; i++) cmp[i] = -1;
        ans = new bool[3 * n];
        if (satisfy())
        {
            var x = new int[n];
            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < 3; j++) if (ans[i + j * n]) x[i] = j + 1;
            }
            WriteJoin(" ", x);
        }
        else Write(-1);
    }

    void add_edge(int x, int y)
    {
        e[x].Add(y);
        re[y].Add(x);
    }
    void dfs(int u)
    {
        cmp[u] = 0;
        for (int i = 0; i < e[u].Count; i++)
        {
            int v = e[u][i];
            if (cmp[v] == -1) dfs(v);
        }
        ps.Add(u);
    }
    void rdfs(int u, int k)
    {
        cmp[u] = k;
        for (int i = 0; i < re[u].Count; i++)
        {
            int v = re[u][i];
            if (cmp[v] == -1) rdfs(v, k);
        }
    }
    int scc()
    {
        for (int i = 0; i < 6 * n; i++) if (cmp[i] == -1) dfs(i);
        for (int i = 0; i < 6 * n; i++) cmp[i] = -1;
        int k = 0;
        for (int i = 6 * m - 1; i >= 0; i--) if (cmp[ps[i]] == -1) rdfs(ps[i], k++);
        return k;
    }
    bool satisfy()
    {
        scc();
        for (int i = 0; i < 3 * n; i++)
        {
            if (cmp[i] == cmp[i + 3 * n]) return false;
            ans[i] = cmp[i] > cmp[i + 3 * n];
        }
        return true;
    }

    const long inf = (long)1 << 60;
    int ri { get { return (int)sc.Integer(); } }
    long rl { get { return sc.Integer(); } }
    double rd { get { return sc.Double(); } }
    string rs { get { return sc.Scan(); } }
    public StreamScanner sc = new StreamScanner(Console.OpenStandardInput());

    void WriteJoin<T>(string s, T[] t) { Console.WriteLine(string.Join(s, t)); }
    void WriteJoin<T>(string s, List<T> t) { Console.WriteLine(string.Join(s, t)); }
    void Write<T>(T t) { Console.WriteLine(t.ToString()); }
    void YN(bool t) { Console.WriteLine(t ? "YES" : "NO"); }
    void Yn(bool t) { Console.WriteLine(t ? "Yes" : "No"); }
    void yn(bool t) { Console.WriteLine(t ? "yes" : "no"); }
    void Swap(ref int x, ref int y) { x ^= y; y ^= x; x ^= y; }
}


public class StreamScanner
{
    public StreamScanner(Stream stream) { str = stream; }
    private readonly Stream str;
    private readonly byte[] buf = new byte[1024];
    private int len, ptr;
    public bool isEof = false;
    public bool IsEndOfStream { get { return isEof; } }
    private byte read()
    {
        if (isEof) throw new EndOfStreamException();
        if (ptr >= len)
        {
            ptr = 0;
            if ((len = str.Read(buf, 0, 1024)) <= 0)
            {
                isEof = true;
                return 0;
            }
        }
        return buf[ptr++];
    }
    public char Char()
    {
        byte b = 0;
        do b = read();
        while (b < 33 || 126 < b);
        return (char)b;
    }
    public string Scan()
    {
        var sb = new StringBuilder();
        for (var b = Char(); b >= 33 && b <= 126; b = (char)read())
            sb.Append(b);
        return sb.ToString();
    }
    public long Integer()
    {
        long ret = 0; byte b = 0; var ng = false;
        do b = read();
        while (b != '-' && (b < '0' || '9' < b));
        if (b == '-') { ng = true; b = read(); }
        for (; true; b = read())
        {
            if (b < '0' || '9' < b)
                return ng ? -ret : ret;
            else ret = ret * 10 + b - '0';
        }
    }
    public double Double() { return double.Parse(Scan()); }
}