Buggy python submission (verdict: Time Limit Exceeded):
import sys
read = sys.stdin.readline
import time
from heapq import heappush, heappop, heapify
import math
import itertools as it
from collections import deque 


def inp():
    return int(input())
def inpl():
    return list(map(int, input().split()))
start_time = time.perf_counter()
# ------------------------------

H, W = inpl()
ch, cw = inpl()
dh, dw = inpl()
ch -= 1
cw -= 1
dh -= 1
dw -= 1

S = []
for i in range(H):
    S.append(input())

dist = []
INF = 1001001001
for i in range(H):
    dist.append([INF for i in range(W)])

q = deque([])
q.append((ch, cw))
dist[ch][cw] = 0
while q:
    h, w = q.popleft()
    # 歩き回る
    for i, j in ((1,0),(-1,0),(0,1),(0,-1)):
        if not 0 <= h + i < H:
            continue
        if not 0 <= w + j < W:
            continue
        if S[h+i][w+j] == '#':
            continue
        if dist[h][w] < dist[h+i][w+j]:
            dist[h+i][w+j] = dist[h][w]
            q.appendleft((h+i, w+j))
    # ワープ
    for i in range(-2, 3):
        for j in range(-2, 3):
            if not 0 <= h + i < H:
                continue
            if not 0 <= w + j < W:
                continue
            if S[h+i][w+j] == '#':
                continue
            if dist[h][w] + 1 < dist[h+i][w+j]:
                dist[h+i][w+j] = dist[h][w] + 1
                q.append((h+i, w+j))

print(dist[dh][dw] if dist[dh][dw] != INF else -1)



# -----------------------------
end_time = time.perf_counter()
print('time:', end_time-start_time, file=sys.stderr)



Fixed submission:
import sys
read = sys.stdin.readline
import time
from heapq import heappush, heappop, heapify
import math
import itertools as it
from collections import deque 


def inp():
    return int(input())
def inpl():
    return list(map(int, input().split()))
start_time = time.perf_counter()
# ------------------------------

H, W = inpl()
ch, cw = inpl()
dh, dw = inpl()
ch -= 1
cw -= 1
dh -= 1
dw -= 1

S = []
for i in range(H):
    S.append(input())

dist = []
INF = 1001001001
for i in range(H):
    dist.append([INF for i in range(W)])

q = deque([])
q.append((ch, cw))
dist[ch][cw] = 0
while q:
    h, w = q.popleft()
    # 歩き回る
    for i, j in ((1,0),(-1,0),(0,1),(0,-1)):
        if not 0 <= h + i < H:
            continue
        if not 0 <= w + j < W:
            continue
        if S[h+i][w+j] == '#':
            continue
        if dist[h][w] < dist[h+i][w+j]:
            dist[h+i][w+j] = dist[h][w]
            q.appendleft((h+i, w+j))
    # ワープ
    for i in range(-2, 3):
        for j in range(-2, 3):
            if not 0 <= h + i < H:
                continue
            if not 0 <= w + j < W:
                continue
            if S[h+i][w+j] == '#':
                continue
            if dist[h][w] + 1 < dist[h+i][w+j]:
                dist[h+i][w+j] = dist[h][w] + 1
                q.append((h+i, w+j))

print(dist[dh][dw] if dist[dh][dw] != INF else -1)



# -----------------------------
end_time = time.perf_counter()
print('time:', end_time-start_time, file=sys.stderr)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
read = sys.stdin.readline
import time
from heapq import heappush, heappop, heapify
import math
import itertools as it
from collections import deque 


def inp():
    return int(input())
def inpl():
    return list(map(int, input().split()))
start_time = time.perf_counter()
# ------------------------------

H, W = inpl()
ch, cw = inpl()
dh, dw = inpl()
ch -= 1
cw -= 1
dh -= 1
dw -= 1

S = []
for i in range(H):
    S.append(input())

dist = []
INF = 1001001001
for i in range(H):
    dist.append([INF for i in range(W)])

q = deque([])
q.append((ch, cw))
dist[ch][cw] = 0
while q:
    h, w = q.popleft()
    # 歩き回る
    for i, j in ((1,0),(-1,0),(0,1),(0,-1)):
        if not 0 <= h + i < H:
            continue
        if not 0 <= w + j < W:
            continue
        if S[h+i][w+j] == '#':
            continue
        if dist[h][w] < dist[h+i][w+j]:
            dist[h+i][w+j] = dist[h][w]
            q.append((h+i, w+j))
    # ワープ
    for i in range(-2, 3):
        for j in range(-2, 3):
            if not 0 <= h + i < H:
                continue
            if not 0 <= w + j < W:
                continue
            if S[h+i][w+j] == '#':
                continue
            if dist[h][w] + 1 < dist[h+i][w+j]:
                dist[h+i][w+j] = dist[h][w] + 1
                q.append((h+i, w+j))

print(dist[dh][dw] if dist[dh][dw] != INF else -1)



# -----------------------------
end_time = time.perf_counter()
print('time:', end_time-start_time, file=sys.stderr)



Fixed submission:
import sys
read = sys.stdin.readline
import time
from heapq import heappush, heappop, heapify
import math
import itertools as it
from collections import deque 


def inp():
    return int(input())
def inpl():
    return list(map(int, input().split()))
start_time = time.perf_counter()
# ------------------------------

H, W = inpl()
ch, cw = inpl()
dh, dw = inpl()
ch -= 1
cw -= 1
dh -= 1
dw -= 1

S = []
for i in range(H):
    S.append(input())

dist = []
INF = 1001001001
for i in range(H):
    dist.append([INF for i in range(W)])

q = deque([])
q.append((ch, cw))
dist[ch][cw] = 0
while q:
    h, w = q.popleft()
    # 歩き回る
    for i, j in ((1,0),(-1,0),(0,1),(0,-1)):
        if not 0 <= h + i < H:
            continue
        if not 0 <= w + j < W:
            continue
        if S[h+i][w+j] == '#':
            continue
        if dist[h][w] < dist[h+i][w+j]:
            dist[h+i][w+j] = dist[h][w]
            q.appendleft((h+i, w+j))
    # ワープ
    for i in range(-2, 3):
        for j in range(-2, 3):
            if not 0 <= h + i < H:
                continue
            if not 0 <= w + j < W:
                continue
            if S[h+i][w+j] == '#':
                continue
            if dist[h][w] + 1 < dist[h+i][w+j]:
                dist[h+i][w+j] = dist[h][w] + 1
                q.append((h+i, w+j))

print(dist[dh][dw] if dist[dh][dw] != INF else -1)



# -----------------------------
end_time = time.perf_counter()
print('time:', end_time-start_time, file=sys.stderr)