using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Globalization;
using System.Diagnostics;
using static System.Console;
using Pair = System.Collections.Generic.KeyValuePair<int, int>;

class Program
{
    static void Main()
    {
        //SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
        new Program().Solve();
        Out.Flush();
    }
    Scanner cin = new Scanner();
    Random rnd = new Random();
    Stopwatch sw = new Stopwatch();
    readonly int[] dd = { 0, 1, 0, -1, 0 };
    readonly int mod = 1000000007;
    readonly string alfa = "abcdefghijklmnopqrstuvwxyz";


    void Solve()
    {
        int H = cin.Nextint;
        int W = cin.Nextint;
        int K = cin.Nextint;
        int P = cin.Nextint;
        var X = new int[K];
        var Y = new int[K];
        var N = new string[K];
        var F = new bool[H + 1, W + 1];


        for (int i = 0; i < K; i++)
        {
            X[i] = cin.Nextint;
            Y[i] = cin.Nextint;
            N[i] = cin.Next;
            F[X[i], Y[i]] = true;
        }

        long ans = 0;
        string friends = "";
        for (int i = 0; i < 1 << K; i++)
        {
            int cnt = 0;
            var G = new List<int>();
            var J = new bool[H + 1, W + 1];
            for (int j = 0; j < K; j++)
            {
                if ((i >> j & 1) == 1)
                {
                    cnt++;
                    G.Add(j);
                    J[X[j], Y[j]] = true;
                }
            }
            if (P != cnt) continue;
            
            //WriteLine(i);

            //if (F[0, 0] && J[0, 0]) continue;
            var dp = new long[H + 1, W + 1];
            dp[0, 0] = 1;
            for (int c = 0; c <= H; c++)
            {
                for (int r = 0; r <= W; r++)
                {
                    if (F[c, r] && !J[c, r]) continue;
                    int x = c - 1;
                    int y = r;
                    if (x >= 0)
                    {
                        dp[c, r] = dp[x, y];
                    }
                    x = c;
                    y = r - 1;
                    if (y >= 0)
                    {
                        dp[c, r] = (dp[c, r] + dp[x, y]) % mod;
                    }
                }
            }
            if (ans < dp[H, W])
            {
                ans = dp[H, W];
                friends = "";
                foreach (var v in G)
                {
                    friends += $"{N[v]}\n";
                }
            }

        }
        WriteLine(ans);
        if(ans > 0)Write(friends);
    }

}

class Scanner
{
    string[] s; int i;
    char[] cs = new char[] { ' ' };
    public Scanner() { s = new string[0]; i = 0; }
    public string[] Scan { get { return ReadLine().Split(); } }
    public int[] Scanint { get { return Array.ConvertAll(Scan, int.Parse); } }
    public long[] Scanlong { get { return Array.ConvertAll(Scan, long.Parse); } }
    public double[] Scandouble { get { return Array.ConvertAll(Scan, double.Parse); } }
    public string Next
    {
        get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return Next;
        }
    }
    public int Nextint { get { return int.Parse(Next); } }
    public long Nextlong { get { return long.Parse(Next); } }
    public double Nextdouble { get { return double.Parse(Next); } }
}