n, m = map(int, input().split())
a = []
for i in range(n):
    s = input()
    a.append(s)

di = [-1, 1, 0, 0]
dj = [0, 0, 1, -1]

for i in range(n):

    for j in range(m):
        if a[i][j] == '#':
            print(a[i][j], end='')
            continue #go to the next j

        hasHashtagNeighbor = False
        for d in range(4):
            ni = i + di[d]
            nj = j + dj[d]
            if ni >= 0 and nj >= 0 and ni < n and nj < m and a[ni][nj] == '#':
                hasHashtagNeighbor = True
        if hasHashtagNeighbor == True:
            print('X', end='')
        else:
            print('.', end='')
    print()