using Yorukatsu017.Questions;
using Yorukatsu017.Extensions;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Yorukatsu017.Questions
{
    public class QuestionB : AtCoderQuestionBase
    {
        bool[][] hasMine;
        int?[][] numbers;
        int h;
        int w;

        public override IEnumerable<object> Solve(TextReader inputStream)
        {
            var hw = inputStream.ReadIntArray();
            h = hw[0];
            w = hw[1];

            hasMine = new bool[h][];
            numbers = new int?[h][];

            for (int i = 0; i < h; i++)
            {
                hasMine[i] = inputStream.ReadLine().Select(c => c == '#').ToArray();
                numbers[i] = hasMine[i].Select(b => b ? null : new int?(0)).ToArray();
            }

            Search();

            foreach (var numberRow in numbers)
            {
                yield return string.Concat(numberRow.Select(i => i == null ? "#" : i.Value.ToString()));
            }
        }

        void Search()
        {
            for (int i = 0; i < h; i++)
            {
                for (int j = 0; j < w; j++)
                {
                    if (hasMine[i][j])
                    {
                        for (int k = Math.Max(i - 1, 0); k <= Math.Min(i + 1, h - 1); k++)
                        {
                            for (int l = Math.Max(j - 1, 0); l <= Math.Min(j + 1, w - 1); l++)
                            {
                                if (!hasMine[k][l])
                                {
                                    numbers[k][l] += 1;
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}


namespace Yorukatsu017
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionB();    // 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 Yorukatsu017.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 Yorukatsu017.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