Buggy python submission (verdict: Time Limit Exceeded):
from sys import stdin
input = stdin.readline
H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[ch == '#' for ch in input().rstrip()] for _ in range(H)]
 
from sys import exit
from collections import deque
from itertools import product
que = deque([c])
passed = set()
queued = set()
nque = set()
cnt = 0
while nque or que:
    while que:
        h,w = que.popleft()
#         print(f'{h=},{w=}')
        if (h,w) == d:
            print(cnt)
            exit()
        if (h,w) in passed:
            continue
        passed.add((h,w))
        for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in queued and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
                que.append((nh,nw))
                queued.add((nh,nw))

        for dh,dw in [
            [-2,-2], [-2,-1], [-2,0], [-2, 1], [-2, 2], 
            [-1,-2], [-1,-1], [-1, 1], [-1, 2], 
            [0,-2], [0, 2], 
            [1,-2], [1,-1], [1, 1], [1, 2], 
            [2,-2], [2,-1], [2,0], [2, 1], [2, 2], 
        ]: 
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in nque and (nh,nw) not in queued and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
                nque.add((nh,nw))
    que = deque(nque)
    nque = set()
    cnt += 1
#     print(f'{que=}, {cnt=}')
print(-1)

Fixed submission:
H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[ch == '#' for ch in input().rstrip()] for _ in range(H)]
 
from sys import exit
from collections import deque
from itertools import product
que = deque([(*c, 0)])
passed = set()
while que:
    h,w,dist = que.popleft()
#         print(f'{h=},{w=}')
    if (h,w) == d:
        print(dist)
        exit()
    if (h,w) in passed:
        continue
    passed.add((h,w))
    for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
            que.appendleft((nh, nw, dist))

    for dh,dw in [
        [-2,-2], [-2,-1], [-2,0], [-2, 1], [-2, 2], 
        [-1,-2], [-1,-1], [-1, 1], [-1, 2], 
        [0,-2], [0, 2], 
        [1,-2], [1,-1], [1, 1], [1, 2], 
        [2,-2], [2,-1], [2,0], [2, 1], [2, 2], 
    ]: 
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
            que.append((nh, nw, dist + 1))
print(-1)

Buggy python submission (verdict: Time Limit Exceeded):
from sys import stdin
input = stdin.readline

H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[int(ch == '#') for ch in input().rstrip()] for _ in range(H)]

from sys import exit
from collections import deque
from itertools import product
que = deque([c])
nque = set()
cnt = 0
while nque or que:
    while que:
        h,w = que.popleft()
#         print(f'{h=},{w=}')
        if (h,w) == d:
            print(cnt)
            exit()

        if maze[h][w]:
            continue

        for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in que and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
                que.append((nh,nw))

        for dh,dw in [
            [-2,-2], [-2,-1], [-2,0], [-2, 1], [-2, 2], 
            [-1,-2], [-1,-1], [-1, 1], [-1, 2], 
            [0,-2], [0, 2], 
            [1,-2], [1,-1], [1, 1], [1, 2], 
            [2,-2], [2,-1], [2,0], [2, 1], [2, 2], 
        ]:
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in nque and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
                nque.add((nh,nw))

        maze[h][w] = 1
    que = deque(nque)
    nque = set()
    cnt += 1
#     print(f'{que=}, {cnt=}')
print(-1)

Fixed submission:
H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[ch == '#' for ch in input().rstrip()] for _ in range(H)]
 
from sys import exit
from collections import deque
from itertools import product
que = deque([(*c, 0)])
passed = set()
while que:
    h,w,dist = que.popleft()
#         print(f'{h=},{w=}')
    if (h,w) == d:
        print(dist)
        exit()
    if (h,w) in passed:
        continue
    passed.add((h,w))
    for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
            que.appendleft((nh, nw, dist))

    for dh,dw in [
        [-2,-2], [-2,-1], [-2,0], [-2, 1], [-2, 2], 
        [-1,-2], [-1,-1], [-1, 1], [-1, 2], 
        [0,-2], [0, 2], 
        [1,-2], [1,-1], [1, 1], [1, 2], 
        [2,-2], [2,-1], [2,0], [2, 1], [2, 2], 
    ]: 
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
            que.append((nh, nw, dist + 1))
print(-1)

Buggy python submission (verdict: Time Limit Exceeded):
from sys import stdin
input = stdin.readline

H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[int(ch == '#') for ch in input().rstrip()] for _ in range(H)]

from sys import exit
from collections import deque
from itertools import product
que = deque([c])
nque = set()
cnt = 0
while nque or que:
    while que:
        h,w = que.popleft()
#         print(f'{h=},{w=}')
        if (h,w) == d:
            print(cnt)
            exit()

        for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
                que.append((nh,nw))

        for dh,dw in [
            [-2,-2], [-2,-1], [-2,0], [-2, 1], [-2, 2], 
            [-1,-2], [-1,-1], [-1, 1], [-1, 2], 
            [0,-2], [0, 2], 
            [1,-2], [1,-1], [1, 1], [1, 2], 
            [2,-2], [2,-1], [2,0], [2, 1], [2, 2], 
        ]:
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
                nque.add((nh,nw))
        
        maze[h][w] = 1
        nque.discard((h,w))
    que = deque(nque)
    nque = set()
    cnt += 1
#     print(f'{que=}, {cnt=}')
print(-1)

Fixed submission:
H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[ch == '#' for ch in input().rstrip()] for _ in range(H)]
 
from sys import exit
from collections import deque
from itertools import product
que = deque([(*c, 0)])
passed = set()
while que:
    h,w,dist = que.popleft()
#         print(f'{h=},{w=}')
    if (h,w) == d:
        print(dist)
        exit()
    if (h,w) in passed:
        continue
    passed.add((h,w))
    for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
            que.appendleft((nh, nw, dist))

    for dh,dw in [
        [-2,-2], [-2,-1], [-2,0], [-2, 1], [-2, 2], 
        [-1,-2], [-1,-1], [-1, 1], [-1, 2], 
        [0,-2], [0, 2], 
        [1,-2], [1,-1], [1, 1], [1, 2], 
        [2,-2], [2,-1], [2,0], [2, 1], [2, 2], 
    ]: 
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
            que.append((nh, nw, dist + 1))
print(-1)

Buggy python submission (verdict: Time Limit Exceeded):
H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[int(ch == '#') for ch in input().rstrip()] for _ in range(H)]

from sys import exit
from collections import deque
from itertools import product
que = deque([c])
passed = set()
queued = set()
nque = set()
cnt = 0
while nque or que:
    while que:
        h,w = que.popleft()
#         print(f'{h=},{w=}')
        if (h,w) == d:
            print(cnt)
            exit()
        if (h,w) in passed:
            continue
        passed.add((h,w))
        for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and (nh,nw) not in queued and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
                que.append((nh,nw))
                queued.add((nh,nw))
                nque.discard((nh,nw))

        for dh,dw in product(range(-2, 3), repeat=2):
            if [dh,dw] in [[0,0], [0,1], [0,-1], [1,0], [-1,0]]:
                continue
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and (nh,nw) not in queued and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
                nque.add((nh,nw))
    que = deque(nque)
    nque = set()
    cnt += 1
#     print(f'{que=}, {cnt=}')
print(-1)

Fixed submission:
H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[ch == '#' for ch in input().rstrip()] for _ in range(H)]
 
from sys import exit
from collections import deque
from itertools import product
que = deque([(*c, 0)])
passed = set()
while que:
    h,w,dist = que.popleft()
#         print(f'{h=},{w=}')
    if (h,w) == d:
        print(dist)
        exit()
    if (h,w) in passed:
        continue
    passed.add((h,w))
    for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
            que.appendleft((nh, nw, dist))

    for dh,dw in [
        [-2,-2], [-2,-1], [-2,0], [-2, 1], [-2, 2], 
        [-1,-2], [-1,-1], [-1, 1], [-1, 2], 
        [0,-2], [0, 2], 
        [1,-2], [1,-1], [1, 1], [1, 2], 
        [2,-2], [2,-1], [2,0], [2, 1], [2, 2], 
    ]: 
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
            que.append((nh, nw, dist + 1))
print(-1)

Buggy python submission (verdict: Time Limit Exceeded):
H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[int(ch == '#') for ch in input().rstrip()] for _ in range(H)]

from sys import exit
from collections import deque
from itertools import product
que = deque([c])
passed = set()
queued = set()
nque = set()
cnt = 0
while nque or que:
    while que:
        h,w = que.popleft()
#         print(f'{h=},{w=}')
        if (h,w) == d:
            print(cnt)
            exit()
        if (h,w) in passed:
            continue
        passed.add((h,w))
        for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and (nh,nw) not in queued and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
                que.append((nh,nw))
                queued.add((nh,nw))

        for dh,dw in product(range(-2, 3), repeat=2):
            nh = h + dh
            nw = w + dw
            if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and (nh,nw) not in queued and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
                nque.add((nh,nw))
    que = deque(nque)
    nque = set()
    cnt += 1
#     print(f'{que=}, {cnt=}')
print(-1)

Fixed submission:
H,W = map(int, input().split())
c = tuple(map(lambda x: int(x) - 1, input().split()))
d = tuple(map(lambda x: int(x) - 1, input().split()))
maze = [[ch == '#' for ch in input().rstrip()] for _ in range(H)]
 
from sys import exit
from collections import deque
from itertools import product
que = deque([(*c, 0)])
passed = set()
while que:
    h,w,dist = que.popleft()
#         print(f'{h=},{w=}')
    if (h,w) == d:
        print(dist)
        exit()
    if (h,w) in passed:
        continue
    passed.add((h,w))
    for dh, dw in [[0,1], [0,-1], [1,0], [-1,0]]:
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'no_warp: {nh=},{nw=}')
            que.appendleft((nh, nw, dist))

    for dh,dw in [
        [-2,-2], [-2,-1], [-2,0], [-2, 1], [-2, 2], 
        [-1,-2], [-1,-1], [-1, 1], [-1, 2], 
        [0,-2], [0, 2], 
        [1,-2], [1,-1], [1, 1], [1, 2], 
        [2,-2], [2,-1], [2,0], [2, 1], [2, 2], 
    ]: 
        nh = h + dh
        nw = w + dw
        if 0 <= nh < H and 0 <= nw < W and (nh,nw) not in passed and not maze[nh][nw]:
#                 print(f'warp: {nh=},{nw=}')
            que.append((nh, nw, dist + 1))
print(-1)