#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;

int main()
{
    int h,w;
    cin>>h>>w;
    vector<string> grid(h);
    for(int i=0;i<h;i++)cin>>grid[i];
    vector<vector<bool>> seen(h,vector<bool>(w));
    int dx[4]={1,0,-1,0},dy[4]={0,1,0,-1};
    for(int i=0;i<h;i++)for(int j=0;j<w;j++){
        if(seen[i][j])continue;
        seen[i][j]=true;
        queue<int> bfs;
        bfs.push(i*w+j);
        set<int> s;
        while(!bfs.empty()){
            int x=bfs.front()/w,y=bfs.front()%w;
            s.insert(bfs.front());
            bfs.pop();
            for(int k=0;k<4;k++){
                int nx=x+dx[k],ny=y+dy[k];
                if(nx<0||nx>=h||ny<0||ny>=w||grid[x][y]!=grid[nx][ny]||seen[nx][ny])continue;
                seen[nx][ny]=true;
                bfs.push(nx*w+ny);
            }

        }if(s.size()>=4)for(int v:s)grid[v/w][v%w]='.';
    }
    for(int i=0;i<h;i++)cout<<grid[i]<<endl;
}