n, m = map(int, input().split()) # n x m field
field = [[] for y in n] # 0 - dead 1 - active
count_active = 0
for i in range(n):
    for x in input().split():
        if x == 'X':
            count_active += 1
            field[i].append(1)
        else:
            field[i].append(0) # X - dead O - active

def get_count(i, j, need, n, m, field):
    count = 0
    if i - 1 >= 0 and field[i - 1][j] == need:
        count += 1
    if j - 1 >= 0 and field[i][j - 1] == need:
        count += 1
    if i + 1 < n and field[i + 1][j] == need:
        count += 1
    if j + 1 < m and field[i][j + 1] == need:
        count += 1
    if i + 1 < n and j + 1 < m and field[i + 1][j + 1] == need:
        count += 1
    if i + 1 < n and j - 1 >= 0 and field[i + 1][j - 1] == need:
        count += 1
    if i - 1 >= 0 and j + 1 < m and field[i - 1][j + 1] == need:
        count += 1
    if i - 1 >= 0 and j - 1 >= 0 and field[i - 1][j - 1] == need:
        count += 1
    return count

con = [] # i j k
while count_active != 0:
    for x in con:
        if x[2] == 0:
            count_active -= 1
        field[x[0]][x[1]] = x[2]
    con = []
    for i in range(n):
        for j in range(m):
            if field[i][j] == 0:
                if get_count(i, j, 1, n, m, field) == 3:
                    con.append([i, j, 1])
            if field[i][j] == 1:
                t = get_count(i, j, 1, n, m, field)
                if t >= 4 or t <= 1:
                    con.append([i, j, 0])
for line in field:
    for x in line:
        print('X' if x == 0 else 'O', end=' ')