import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

from collections import defaultdict
 
class UnionFind():
    def __init__(self, n):
        self.n = n
        self.parents = [-1] * n
 
    def find(self, x):
        if self.parents[x] < 0:
            return x
        else:
            self.parents[x] = self.find(self.parents[x])
            return self.parents[x]
 
    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)
 
        if x == y:
            return
 
        if self.parents[x] > self.parents[y]:
            x, y = y, x
 
        self.parents[x] += self.parents[y]
        self.parents[y] = x
 
    def size(self, x):
        return -self.parents[self.find(x)]
 
    def same(self, x, y):
        return self.find(x) == self.find(y)
 
    def members(self, x):
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i) == root]
 
    def roots(self):
        return [i for i, x in enumerate(self.parents) if x < 0]
 
    def group_count(self):
        return len(self.roots())
 
    def all_group_members(self):
        group_members = defaultdict(list)
        for member in range(self.n):
            group_members[self.find(member)].append(member)
        return group_members
 
    def __str__(self):
        return '\n'.join(f'{r}: {m}' for r, m in self.all_group_members().items())

from math import gcd

h,w = na()
uf = UnionFind(h*w)
s = [input() for i in range(h)]
for i in range(h-1):
    for j in range(w):
        if s[i][j] == s[i+1][j]:
            uf.union(i*w+j, (i+1)*w+j)
for i in range(h):
    for j in range(w-1):
        if s[i][j] == s[i][j+1]:
            uf.union(i*w+j,i*w+j+1)

d = uf.all_group_members()
ans = [list(s[i]) for i in range(h)]
for i in d:
    if uf.size(i) < 4:continue
    for j in d[i]:
        x,y = divmod(j, w)
        ans[x][y] = "."

for i in range(h):
    print("".join(ans[i]))