using Yorukatsu037.Questions;
using Yorukatsu037.Extensions;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Yorukatsu037.Questions
{
    /// <summary>
    /// ARC080 D
    /// </summary>
    public class QuestionD : AtCoderQuestionBase
    {
        public override IEnumerable<object> Solve(TextReader inputStream)
        {
            var hw = inputStream.ReadIntArray();
            var h = hw[0];
            var w = hw[1];
            var colors = inputStream.ReadInt();
            var colorsCounts = inputStream.ReadIntArray();

            var color = 0;
            var count = 0;
            var c = Enumerable.Repeat(0, h).Select(_ => new int[w]).ToArray();
            for (int row = 0; row < h; row++)
            {
                if (row % 2 == 0)
                {
                    for (int column = 0; column < w; column++)
                    {
                        c[row][column] = color + 1;
                        if (++count == colorsCounts[color])
                        {
                            color++;
                            count = 0;
                        }
                    }
                }
                else
                {
                    for (int column = w - 1; column >= 0; column--)
                    {
                        c[row][column] = color + 1;
                        if (++count == colorsCounts[color])
                        {
                            color++;
                            count = 0;
                        }
                    }
                }
            }

            foreach (var row in c)
            {
                yield return string.Join(" ", row);
            }
        }
    }
}


namespace Yorukatsu037
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionD();    // 問題に合わせて書き換え
            var answers = question.Solve(Console.In);
            foreach (var answer in answers)
            {
                Console.WriteLine(answer);
            }
        }
    }
}

#region Base Classes

namespace Yorukatsu037.Questions
{

    public interface IAtCoderQuestion
    {
        IEnumerable<object> Solve(string input);
        IEnumerable<object> Solve(TextReader inputStream);
    }

    public abstract class AtCoderQuestionBase : IAtCoderQuestion
    {
        public IEnumerable<object> Solve(string input)
        {
            var stream = new MemoryStream(Encoding.Unicode.GetBytes(input));
            var reader = new StreamReader(stream, Encoding.Unicode);

            return Solve(reader);
        }

        public abstract IEnumerable<object> Solve(TextReader inputStream);
    }

}

#endregion

#region Extensions

namespace Yorukatsu037.Extensions
{
    internal static class TextReaderExtensions
    {
        internal static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader));
        internal static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader));
        internal static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader));
        internal static string ReadString(this TextReader reader) => reader.ReadLine();

        internal static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray();
        internal static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray();
        internal static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray();
        internal static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator);
    }
}

#endregion

Measured memory_bytes: 13524