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#include <iostream>
#include <string>

using namespace std;

int main ()
{
    int n,m;
    char c[10][10];
    cin >> n >> m;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
        {
            cin >> c[i][j];
        }
    }
    c[0][0] = 'E';
    c[n-1][0] = 'D';
    c[0][m-1] = 'F';
    c[n-1][m-1] = 'C';
    
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
        {
            if (c[i][j] == 'A')
            {
                if (j == 0) {c[i][j] = 'B';} else
                {if (i>0 && c[i][j-1] != 'A' && c[i][j-1] != 'D' && c[i][j-1] != 'E' && (c[i-1][j] == 'E' || c[i-1][j] == 'F' || c[i-1][j] == 'B')) c[i][j] = 'B';}

            } 
            else 
            {
                    if (c[i][j] == 'B')
                {
                    if (i == 0) {c[i][j] = 'A';} else
                    {if (j>0 && c[i-1][j] != 'B' && c[i-1][j] != 'F' && c[i-1][j] != 'E' && (c[i][j-1] == 'D' || c[i][j-1] == 'F' || c[i][j-1] == 'A')) c[i][j] = 'A';}

                } 
                else
                { //уголки
                    if (i==0 && j > 0) 
                    {
                        if (c[i][j-1] == 'A' || c[i][j-1] == 'E') c[i][j] = 'F'; else c[i][j] = 'E';
                    } 
                    else
                    {
                        if (i==n-1 && j > 0) 
                        {
                            if (c[i][j-1] == 'A' || c[i][j-1] == 'D') c[i][j] = 'C'; else c[i][j] = 'D';
                        } 
                        else
                        {
                            if (j==0 && i > 0)
                            {
                                if (c[i-1][j] == 'B' || c[i-1][j] == 'E') c[i][j] = 'D'; else c[i][j] = 'E';
                            } 
                            else
                            {
                                if (j==m-1 && i > 0)
                                {
                                    if (c[i-1][j] == 'B' || c[i-1][j] == 'F') c[i][j] = 'C'; else c[i][j] = 'F';
                                }
                                else 
                                {
                                    if ((c[i-1][j] == 'B' || c[i-1][j] == 'F') && (c[i][j-1] == 'A' || c[i][j-1] == 'D')) c[i][j] = 'C';
                                    else
                                    {
                                        if (c[i-1][j] == 'B' || c[i-1][j] == 'E') c[i][j] = 'D';
                                        else
                                        {
                                            if (c[i][j-1] == 'A' || c[i][j-1] == 'E') c[i][j] = 'F';
                                            else c[i][j] = 'E';
                                        }
                                    }
                                }
                            }
                        }
                    }                   
                }
            }
        }
    }

    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
        {
            cout << c[i][j];
        }
        cout << endl;
    }
}