using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;

class Myon
{
    public Myon() { }
    public static int Main()
    {
        cin = new Scanner();
        new Myon().calc();
        return 0;
    }

    static Scanner cin;

    // メンバ変数---
    int H;
    int W;
    int N;
    int[] A;
    // -------------

    void calc()
    {
        H = cin.nextInt();
        W = cin.nextInt();
        N = cin.nextInt();
        A = cin.ArrayInt(N);

        List<int> number = new List<int>();
        for(int j = 0;j < A.Length; j++)
        {
            for (int i = 0; i < A[j]; i++)
            {
                number.Add(j+1);
            }
        }

        number.Sort();

        // trueのときは左から
        bool switchDirect = true;
        int idx = 0;
        for (int i = 0; i < H; i++)
        {
            int[] print = new int[W];
            if (switchDirect)
            {
                for(int j = 0;j < W; j++)
                {
                    print[j] = number[idx];
                    idx++;
                }
            }
            else
            {
                for(int j = W-1;-1 < j; j--)
                {
                    print[j] = number[idx];
                    idx++;
                }
            }
            switchDirect = !switchDirect;

            Console.WriteLine(string.Join(" ", print));

        }

    }

    void Write<T>(T v)
    {
        Console.WriteLine(v);
    }

    int Pow(int x, int y)
    {
        return (int)Math.Pow(double.Parse(x.ToString()), double.Parse(y.ToString()));
    }

    double Pow(double x, double y)
    {
        return Math.Pow(x, y);
    }

    class Scanner
    {
        string[] s;
        int i;

        char[] cs = new char[] { ' ' };

        public Scanner()
        {
            s = new string[0];
            i = 0;
        }

        public string next()
        {
            if (i < s.Length) return s[i++];
            string st = Console.ReadLine();
            while (st == "") st = Console.ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            if (s.Length == 0) return next();
            i = 0;
            return s[i++];
        }

        public int nextInt()
        {
            return int.Parse(next());
        }
        public int[] ArrayInt(int N, int add = 0)
        {
            int[] Array = new int[N];
            for (int i = 0; i < N; i++)
            {
                Array[i] = nextInt() + add;
            }
            return Array;
        }

        public long nextLong()
        {
            return long.Parse(next());
        }

        public long[] ArrayLong(int N, long add = 0)
        {
            long[] Array = new long[N];
            for (int i = 0; i < N; i++)
            {
                Array[i] = nextLong() + add;
            }
            return Array;
        }

        public double nextDouble()
        {
            return double.Parse(next());
        }


        public double[] ArrayDouble(int N, double add = 0)
        {
            double[] Array = new double[N];
            for (int i = 0; i < N; i++)
            {
                Array[i] = nextDouble() + add;
            }
            return Array;
        }
    }
}


Measured memory_bytes: 13652