n,m=map(int,input().split())
map_=[]
for _ in range(n):
tmp=list(input())
map_.append(tmp)mm=[(1,0),(-1,0),(0,1),(0,-1)]
def dfs(a,b,q):
q.append((a,b))
map_[a][b]='.'
for i,j in mm:
x=a+i
y=b+j
if (x>=0 and x<n and y>=0 and y<m and map_[x][y]=='X'):
dfs(x,y,q)p=[[],[]]
k=0
for i in range (n):
for j in range(m):
if map_[i][j]=='X':
dfs(i,j,p[k])
k+=1
res=float('inf')
for i in p[0]:
for j in p[1]:
res=min(res,abs(i[0]-j[0])+abs(i[1]-j[1]))
print(res-1)
def dfs(u, cur, start):
if u * len_ == sum_ : return True
if (cur ==len_): return dfs(u+1,0,0)
for i in range (start,n):
if st[i]:continue
if (cur+w[i]<=len_):
st[i]=1
if (dfs(u,cur+w[i],i+1)):return True
st[i]=0
if (not cur or cur+w[i]==len_):return False
j=i=1
while(j<n and w[i]==w[j]):j+=1
i=j-1n = int(input())
while (n):
sum_ = len_ = 0
w = list(map(int, input().split()))
sum_ = sum(w)
len_ = max(w)
# print(sum_,len_)
w.sort()
st = [0 for _ in range(n)]
while (True):
if (sum_ % len_ == 0 and dfs(0, 0, 0)):
print(len_)
break
len_ += 1n = int(input())
import os
import sys
# 请在此输入您的代码
data='''
110010000011111110101001001001101010111011011011101001111110
010000000001010001101100000010010110001111100010101100011110
001011101000100011111111111010000010010101010111001000010100
101100001101011101101011011001000110111111010000000110110000
010101100100010000111000100111100110001110111101010011001011
010011011010011110111101111001001001010111110001101000100011
101001011000110100001101011000000110110110100100110111101011
101111000000101000111001100010110000100110001001000101011001
001110111010001011110000001111100001010101001110011010101110
001010101000110001011111001010111111100110000011011111101010
011111100011001110100101001011110011000101011000100111001011
011010001101011110011011111010111110010100101000110111010110
001110000111100100101110001011101010001100010111110111011011
111100001000001100010110101100111001001111100100110000001101
001110010000000111011110000011000010101000111000000110101101
100100011101011111001101001010011111110010111101000010000111
110010100110101100001101111101010011000110101100000110001010
110101101100001110000100010001001010100010110100100001000011
100100000100001101010101001101000101101000000101111110001010
101101011010101000111110110000110100000010011111111100110010
101111000100000100011000010001011111001010010001010110001010
001010001110101010000100010011101001010101101101010111100101
001111110000101100010111111100000100101010000001011101100001
101011110010000010010110000100001010011111100011011000110010
011110010100011101100101111101000001011100001011010001110011
000101000101000010010010110111000010101111001101100110011100
100011100110011111000110011001111100001110110111001001000111
111011000110001000110111011001011110010010010110101000011111
011110011110110110011011001011010000100100101010110000010011
010011110011100101010101111010001001001111101111101110011101
'''
def dfs(x,y):
global res
if (x<0 or x>29 or y<0 or y>59 or data[x][y]=='0' or check[x][y]==1):
return
res+=1
check[x][y]=1
for i in map:
xt=i[0]+x
yt=i[1]+y
dfs(xt,yt)
map=[(-1,0),(0,-1),(1,0),(0,1)]
data=data.split()
# 检查点
check=[[0 for _ in range (60)] for _ in range (30)]
max_=0
for i in range (30):
for j in range (60):
if data[i][j]=='1' and check[i][j]==0:
res=0
dfs(i,j)
max_=max(max_,res)
print(max_)
n,m=map(int,input().split())
# 构建前戳和二维数组
dp=list([0 for _ in range (m+2)] for _ in range(n+2) )
t=int(input())
for _ in range(t):
x1,y1,x2,y2=map(int,input().split())
dp[x1][y1]+=1
dp[x1][y2+1]-=1
dp[x2+1][y1]-=1
dp[x2+1][y2+1]+=1
res=0
for i in range (1,n+1):
for j in range (1,m+1):
dp[i][j]=dp[i-1][j]+dp[i][j-1]-dp[i-1][j-1]+dp[i][j]
if dp[i][j]==0:
res+=1
print(res)
