Buggy python submission (verdict: Runtime Error):
from collections import deque
import sys

imput = sys.stdin.readline

h,w = map(int,input().split())
sy,sx= map(int,input().split())
gy,gx= map(int,input().split())
S=[]



for i in range(h):
    S.append(input())

walk = [[1,0],[-1,0],[0,1],[0,-1]]
move = [[x,y] for x in range(-2,3) for y in range(-2,3) if [x,y] not in walk + [[0,0]]] 

dist = [[99999]*w for i in range(h)]
#visited = [[0]*w for i in range(h)]

q=deque()
q.append((sx-1,sy-1,0))
dist[sy-1][sx-1]=0
goaled = 0
endwarp=0
#while goaled==0:
while len(q):
    endwarp=0
    
    x,y,d = q.popleft()
    
#    if x==gx-1 and y==gy-1:
#        goaled=1
#        print(d)
#        break
    
#    print(x,y,d)
    for i in walk:
        if 0<=x+i[0]<w and 0<=y+i[1]<h and S[y+i[1]][x+i[0]]!="#" and if dist[y+i[1]][x+i[0]] > d:

                    dist[y+i[1]][x+i[0]] = d
                    q.appendleft((x+i[0],y+i[1],d+0))

    for i in move:
        if 0<=x+i[0]<w and 0<=y+i[1]<h and S[y+i[1]][x+i[0]]!="#" and if dist[y+i[1]][x+i[0]] > d+1:

                    dist[y+i[1]][x+i[0]] = d
                    q.append((x+i[0],y+i[1],d+1))
                        
                        
                         
    
    

if dist[gy-1][gx-1]==99999:
    print(-1)
    
else:
    print(dist[gy-1][gx-1])


Fixed submission:
from collections import deque
import sys

imput = sys.stdin.readline

h,w = map(int,input().split())
sy,sx= map(int,input().split())
gy,gx= map(int,input().split())
S=[]



for i in range(h):
    S.append(input())

walk = [[1,0],[-1,0],[0,1],[0,-1]]
move = [[x,y] for x in range(-2,3) for y in range(-2,3) if [x,y] not in walk + [[0,0]]] 

dist = [[9999999]*w for i in range(h)]
#visited = [[0]*w for i in range(h)]

q=deque()
q.append((sx-1,sy-1,0))
dist[sy-1][sx-1]=0
goaled = 0
endwarp=0
#while goaled==0:
while len(q):
    endwarp=0
    
    x,y,d = q.popleft()
    
#    if x==gx-1 and y==gy-1:
#        goaled=1
#        print(d)
#        break
    
#    print(x,y,d)
    for i in walk:
        if 0<=x+i[0]<w and 0<=y+i[1]<h and S[y+i[1]][x+i[0]]!="#" and dist[y+i[1]][x+i[0]] > d:

                    dist[y+i[1]][x+i[0]] = d
                    q.appendleft((x+i[0],y+i[1],d+0))

    for i in move:
        if 0<=x+i[0]<w and 0<=y+i[1]<h and S[y+i[1]][x+i[0]]!="#" and dist[y+i[1]][x+i[0]] > d+1:

                    dist[y+i[1]][x+i[0]] = d+1
                    q.append((x+i[0],y+i[1],d+1))
                        
                        
                         
    
    

if dist[gy-1][gx-1]==9999999:
    print(-1)
    
else:
    print(dist[gy-1][gx-1])

Buggy python submission (verdict: Runtime Error):
import queue
h,w = map(int,input().split())
sy,sx= map(int,input().split())
gy,gx= map(int,input().split())
S=[]



for i in range(h):
    S.append(input())
    
move = [[x,y] for x in range(-2,3) for y in range(-2,3)] 
walk = [[1,0],[-1,0],[0,1],[0,-1]]
dist = [[99999]*w for i in range(h)]
#visited = [[0]*w for i in range(h)]

q=queue.Queue()
q.put((sx-1,sy-1,0))
dist[sy][sx]=0
goaled = 0

#while goaled==0:
while not q.empty():
    
    x,y,d = q.get()
    
    if x==gx-1 and y==gy-1:
        goaled=1
#        print(d)
#        break
    
    print(x,y,d)
    for i in move:
        if 0<=x+i[0]<w and 0<=y+i[1]<h:
            if S[y+i[1]][x+i[0]]!="#" :
            
#                if visited[x+i[0]][y+i[1]] == 0:
                if dist[y+i[1]][x+i[0]] > d:
                
                    

                    if abs(i[0])+abs(i[1])==1:
                        dist[y+i[1]][x+i[0]] = d
                        q.put((x+i[0],y+i[1],d+0))
                    else:  
                        dist[y+i[1]][x+i[0]] = d+1
                        q.put((x+i[0],y+i[1],d+1))

Fixed submission:
from collections import deque
import sys

imput = sys.stdin.readline

h,w = map(int,input().split())
sy,sx= map(int,input().split())
gy,gx= map(int,input().split())
S=[]



for i in range(h):
    S.append(input())

walk = [[1,0],[-1,0],[0,1],[0,-1]]
move = [[x,y] for x in range(-2,3) for y in range(-2,3) if [x,y] not in walk + [[0,0]]] 

dist = [[9999999]*w for i in range(h)]
#visited = [[0]*w for i in range(h)]

q=deque()
q.append((sx-1,sy-1,0))
dist[sy-1][sx-1]=0
goaled = 0
endwarp=0
#while goaled==0:
while len(q):
    endwarp=0
    
    x,y,d = q.popleft()
    
#    if x==gx-1 and y==gy-1:
#        goaled=1
#        print(d)
#        break
    
#    print(x,y,d)
    for i in walk:
        if 0<=x+i[0]<w and 0<=y+i[1]<h and S[y+i[1]][x+i[0]]!="#" and dist[y+i[1]][x+i[0]] > d:

                    dist[y+i[1]][x+i[0]] = d
                    q.appendleft((x+i[0],y+i[1],d+0))

    for i in move:
        if 0<=x+i[0]<w and 0<=y+i[1]<h and S[y+i[1]][x+i[0]]!="#" and dist[y+i[1]][x+i[0]] > d+1:

                    dist[y+i[1]][x+i[0]] = d+1
                    q.append((x+i[0],y+i[1],d+1))
                        
                        
                         
    
    

if dist[gy-1][gx-1]==9999999:
    print(-1)
    
else:
    print(dist[gy-1][gx-1])