# include <iostream>
# include <cstdio>
# include <ctime>
# include <cstdlib>
# include <cmath>
# define for(xxx, yyy, zzz) for(int xxx = yyy; xxx <= zzz; ++xxx)

using namespace std;

const int MAXN = int(1e2) + 4;
const int INF = int(1e4);
const int MN = int(1e4) + 4;

char s[MAXN][MAXN];
short dx[] = {1, -1, 0, 0};
short dy[] = {0, 0, 1, -1};
short qx[MN], qy[MN], qh, qt;
short dp[MAXN][MAXN];
short c[MAXN][MAXN];
int n, m, col = 1;
short aa, bb, cc, dd, Maxans;

int main () {

//	freopen("input.txt", "r", stdin);
//	freopen("output.txt", "w", stdout);

	scanf("%d %d\n", &n, &m);
	for (i, 1, n)
		for (j, 1, m) {
			scanf("%c", &s[i][j]);
			if(j == m) scanf("\n");
			dp[i][j] = INF;
			c[i][j] = 1;
		}

	for (i, 1, n) {
		for (j, 1, m) {

			if(s[i][j] == '#') {
				qt = qh = 0;
		     	qh ++;
				qx[qh] = i; qy[qh] = j;
				dp[i][j] = 0;
			}

			else continue;

			while (qt < qh) {
				qt ++;
				short xx = qx[qt], yy = qy[qt];
				if(dp[xx][yy] > Maxans) {
					if(aa != i)aa = i;
					if(bb != j)bb = j;
					cc = xx;
					dd = yy;
					Maxans = dp[xx][yy];
				}

				for (it, 0, 3) {

					if(xx + dx[it] <= n && xx + dx[it] >= 1 && yy + dy[it] <= m && yy + dy[it] >= 1)
					if(s[xx + dx[it]][yy + dy[it]] == '#' && dp[xx][yy] + 1 < dp[xx + dx[it]][yy + dy[it]])
					if(c[xx + dx[it]][yy + dy[it]] == col){
						qh ++;
						qx[qh] = xx + dx[it];
						qy[qh] = yy + dy[it];
						dp[xx + dx[it]][yy + dy[it]] = dp[xx][yy] + 1;
					}
				}
				c[xx][yy] = col + 1;
				dp[xx][yy] = INF;
			}

			col ++;

		}
	}

	s[aa][bb] = 'X';
	s[cc][dd] = 'X';

	for (i, 1, n) {
		for (j, 1, m) {
			putchar(s[i][j]);
		}
		puts("");
	}

	return 0;
}