fn main() {
    input!{
		h: usize, w: usize,
		g: [Chars; h],
	}

	// 先頭座標-連結成分の個数 を管理
	let mut mp = HashMap::new();

	// 探索の先頭座標を入れる
	let mut seen = vec![vec![INF; w]; h];

	let d = vec!{(!0, 0), (0, !0), (1, 0), (0, 1)}; // 上左下右
	
	// 各マス試す
	for i in 0..h {
		for j in 0..w {
			if seen[i][j] != INF { continue; }

			// BFS
			{
				let mut cnt = 0; // 同じ色の個数

				let mut dq = VecDeque::new();
				dq.push_back((i, j));
				seen[i][j] = i*w+j;
				cnt += 1;

				while dq.len() > 0 {
					let (ci, cj) = dq.pop_front().unwrap();
					for k in 0..4 {
						let ni = ci.wrapping_add(d[k].0);
						let nj = cj.wrapping_add(d[k].1);
						if ni >= h || nj >= w || seen[ni][nj] != INF || g[ni][nj] != g[ci][cj] { continue; }
						seen[ni][nj] = i*w+j;
						dq.push_back((ni, nj));
						cnt += 1;
					}
				}
				mp.insert(i*w+j, cnt);
			}

		}
	}

	// seenの値にある連結成分を確認して、4以上なら.にする。
	let mut ans_g = g.clone();
	for i in 0..h {
		for j in 0..w {
			let num = seen[i][j];
			if *mp.get(&num).unwrap() >= 4 {
				ans_g[i][j] = '.';
			}
		}
	}
	for i in 0..h {
		for j in 0..w {
			print!("{}", ans_g[i][j]);
		}
		println!();
	}
}

// const MOD17: usize = 1000000007;
// const MOD93: usize = 998244353;
const INF: usize = 1 << 60;
// let dx = vec![!0, 0, 1, 0]; // 上左下右
// let dy = vec![0, !0, 0, 1]; // 上左下右


#[allow(unused)]
use proconio::{input, marker::Chars, marker::Usize1};

#[allow(unused)]
use std::{
	mem::swap,
	cmp::min, cmp::max,
	cmp::Reverse,
	collections::HashSet, collections::BTreeSet,
	collections::HashMap, collections::BTreeMap,
	collections::BinaryHeap,
	collections::VecDeque,
	iter::FromIterator,
};