#include <bits/stdc++.h>
using namespace std;
int main () {
	int H, W;
	cin >> H >> W;
	std::vector A(H + 2, vector(W + 2, '#')) ;
	for (int i = 1; i <= H; i++) {
		for (int j = 1; j <= W; j ++) {
			cin >> A[i][j];
		}
	}
	vector<vector<int>> did(H + 2, vector(W + 2, -1));
	vector<int> siz;
	for (int i = 1; i <= H; i ++) {
		for (int j = 1; j <= W; j ++) {
			if (did[i][j] >= 0 || (A[i][j] == '.')) continue;
			char c = A[i][j];
			int mi[] = {0, 1, 0, -1}, mj[] = {1, 0, -1, 0};
			stack<pair<int, int>> st;
			st.emplace(i, j);
			int n = 1;
			did[i][j] = siz.size();
			while (!st.empty()) {
				auto [p, q] = st.top();
				st.pop();
				for (int d = 0; d < 4; d ++) {
					int r = p + mi[d], s = q + mj[d];
					if (A[r][s] == c && did[r][s] < 0) {
						did[r][s] = did[i][j];
						st.emplace(r, s);
						n ++;
					}
				}
			}
			siz.push_back(n);
		}
	}
	for (int i = 1; i <= H; i ++) {
		for (int j = 1; j <= W; j ++) {
			if (did[i][j] < 0) cout << A[i][j];
			else cout << (siz[did[i][j]] >= 4 ? '.' : A[i][j]);
		}
		cout << endl;
	}
}