#![allow(non_snake_case, unused_must_use, unused_imports)]
use std::io::{self, prelude::*};

fn main() {
    let (stdin, stdout) = (io::read_to_string(io::stdin()).unwrap(), io::stdout());
    let (mut stdin, mut buffer) = (stdin.split_whitespace(), io::BufWriter::new(stdout.lock()));
    macro_rules! input {
        ($t: ty, $n: expr) => {
            (0..$n).map(|_| input!($t)).collect::<Vec<_>>()
        };
        ($t: ty) => {
            stdin.next().unwrap().parse::<$t>().unwrap()
        };
    }

    let H = input!(usize);
    let W = input!(usize);

    let G = (0..H)
        .map(|_| input!(String).chars().collect::<Vec<_>>())
        .collect::<Vec<_>>();

    let mut uf = unionfind::UnionFind::new(H * W);

    let f = |y: usize, x: usize| y * W + x;

    for i in 0..H {
        for j in 0..W {
            if i + 1 < H && G[i][j] == G[i + 1][j] {
                uf.unite(f(i, j), f(i + 1, j));
            }

            if j + 1 < W && G[i][j] == G[i][j + 1] {
                uf.unite(f(i, j), f(i, j + 1));
            }
        }
    }

    for (i, g) in G.into_iter().enumerate() {
        writeln!(
            buffer,
            "{}",
            g.into_iter()
                .enumerate()
                .map(|(j, c)| if uf.size(f(i, j)) >= 4 {
                    ".".to_string()
                } else {
                    format!("{}", c)
                })
                .collect::<Vec<_>>()
                .join("")
        );
    }
}

#[rustfmt::skip]
pub mod unionfind {pub struct UnionFind { data: Vec<i32>,}impl UnionFind { pub fn new(size: usize) -> Self { return Self { data: vec![-1; size], }; } pub fn is_same(&mut self, u: usize, v: usize) -> bool { assert!(v < self.data.len() && u < self.data.len()); self.find(u) == self.find(v) } pub fn unite(&mut self, mut a: usize, mut b: usize) -> () { assert!(a < self.data.len() && b < self.data.len()); a = self.find(a); b = self.find(b); if a == b { return; } if self.data[a] > self.data[b] { (a, b) = (b, a); } self.data[a] += self.data[b]; self.data[b] = a as i32; } pub fn size(&mut self, mut v: usize) -> i32 { assert!(v < self.data.len()); v = self.find(v); -self.data[v] } pub fn find(&mut self, v: usize) -> usize { assert!(v < self.data.len()); if self.data[v] < 0 { return v; } self.data[v] = self.find(self.data[v] as usize) as i32; return self.data[v] as usize; }}}