#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using ll = long long;
using ull = unsigned long long;

#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)


random_device rnd;
mt19937 mt(rnd());
int RandInt(int a, int b) {
    return a + mt() % (b - a + 1);
}

const int dx[4] = {0, 1, 0, -1};
const int dy[4] = {1, 0, -1, 0};

bool used[1010][1010];
int h,w;
vector<string> s;
int f(int x,int y,int cnt){
    used[x][y]=true;
    queue<pair<int,int>> q;
    q.push({x,y});
    while(!q.empty()){
        auto [x,y]=q.front();q.pop();
        rep(i,4){
            int nx=x+dx[i];
            int ny=y+dy[i];
            if(nx<0||nx>=h||ny<0||ny>=w)continue;
            if(used[nx][ny])continue;
            if(s[nx][ny]=='.')continue;
            if(s[x][y]!=s[nx][ny])continue;
            cnt++;
            used[nx][ny]=true;
            q.push({nx,ny});
        }
    }
    return cnt;
}
void f2(int x,int y,char c){
    rep(i,4){
        int nx=x+dx[i];
        int ny=y+dy[i];
        if(nx<0||nx>=h||ny<0||ny>=w)continue;       
        if(s[nx][ny]==c){
            s[nx][ny]='.';
            f2(nx,ny,c);
        }
    }
    s[x][y]='.';
}
int main(){
    cin>>h>>w;
    s.resize(h);
    rep(i,h) cin>>s[i];
    rep(i,h)rep(j,w){
        if(used[i][j])continue;
        int cnt=f(i,j,1);
        //cerr<<i<<" "<<j<<" "<<cnt<<endl;
        if(cnt>=4)f2(i,j,s[i][j]);
    }
    rep(i,h)cout<<s[i]<<endl;
}