Buggy python submission (verdict: Runtime Error):
def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] != "$" and farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] != "$" and farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] != "$" and farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] != "$" and farm[x][y - 1] == flag : check(x, y - 1, flag)

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (w + 2)))
	for i in range(0, h):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (w + 2)))
	
	count = 0
	for i in range(0, h):
		for j in range(0, w):
			if farm[i + 1][j + 1] != "$":
				check(i + 1, j + 1, farm[i + 1][j + 1])
				count += 1
				
	print count

Fixed submission:
import sys
sys.setrecursionlimit(100000)

def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] == flag : check(x, y - 1, flag)
	return 1

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (w + 2)))
	for i in range(0, h):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (w + 2)))
	
	count = 0
	for i in range(0, h):
		for j in range(0, w):
			if farm[i + 1][j + 1] != "$":
				count += check(i + 1, j + 1, farm[i + 1][j + 1])
				
	print count

Buggy python submission (verdict: Runtime Error):
def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] == flag : check(x, y - 1, flag)

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (w + 2)))
	for i in range(0, h):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (w + 2)))
	
	count = 0
	for i in range(0, h):
		for j in range(0, w):
			if farm[i + 1][j + 1] != "$":
				check(i + 1, j + 1, farm[i + 1][j + 1])
				count += 1
				
	print count

Fixed submission:
import sys
sys.setrecursionlimit(100000)

def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] == flag : check(x, y - 1, flag)
	return 1

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (w + 2)))
	for i in range(0, h):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (w + 2)))
	
	count = 0
	for i in range(0, h):
		for j in range(0, w):
			if farm[i + 1][j + 1] != "$":
				count += check(i + 1, j + 1, farm[i + 1][j + 1])
				
	print count

Buggy python submission (verdict: Runtime Error):
def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] == flag : check(x, y - 1, flag)

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (h + 2)))
	for i in range(0, w):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (h + 2)))
	
	count = 0
	for i in range(0, w):
		for j in range(0, h):
			if farm[i + 1][j + 1] != "$":
				check(i + 1, j + 1, farm[i + 1][j + 1])
				count += 1
				
	print count

Fixed submission:
import sys
sys.setrecursionlimit(100000)

def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] == flag : check(x, y - 1, flag)
	return 1

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (w + 2)))
	for i in range(0, h):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (w + 2)))
	
	count = 0
	for i in range(0, h):
		for j in range(0, w):
			if farm[i + 1][j + 1] != "$":
				count += check(i + 1, j + 1, farm[i + 1][j + 1])
				
	print count

Buggy python submission (verdict: Runtime Error):
def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] == flag : check(x, y - 1, flag)
	return 1

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (w + 2)))
	for i in range(0, h):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (w + 2)))
	
	count = 0
	for i in range(0, h):
		for j in range(0, w):
			if farm[i + 1][j + 1] != "$":
				count += check(i + 1, j + 1, farm[i + 1][j + 1])
				
	print count

Fixed submission:
import sys
sys.setrecursionlimit(100000)

def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] == flag : check(x, y - 1, flag)
	return 1

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (w + 2)))
	for i in range(0, h):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (w + 2)))
	
	count = 0
	for i in range(0, h):
		for j in range(0, w):
			if farm[i + 1][j + 1] != "$":
				count += check(i + 1, j + 1, farm[i + 1][j + 1])
				
	print count

Buggy python submission (verdict: Runtime Error):
import sys
sys.setrecursionlimit(10000)

def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] == flag : check(x, y - 1, flag)
	return 1

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (w + 2)))
	for i in range(0, h):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (w + 2)))
	
	count = 0
	for i in range(0, h):
		for j in range(0, w):
			if farm[i + 1][j + 1] != "$":
				count += check(i + 1, j + 1, farm[i + 1][j + 1])
				
	print count

Fixed submission:
import sys
sys.setrecursionlimit(100000)

def check(x, y, flag):
	farm[x][y] = "$"
	if farm[x + 1][y] == flag : check(x + 1, y, flag)
	if farm[x - 1][y] == flag : check(x - 1, y, flag)
	if farm[x][y + 1] == flag : check(x, y + 1, flag)
	if farm[x][y - 1] == flag : check(x, y - 1, flag)
	return 1

while True:
	h,w = map(int, raw_input().split())
	if h == 0 and w == 0 : break

	farm = []
	farm.append(list("$" * (w + 2)))
	for i in range(0, h):
		farm.append(list("$" + raw_input() + "$"))
	farm.append(list("$" * (w + 2)))
	
	count = 0
	for i in range(0, h):
		for j in range(0, w):
			if farm[i + 1][j + 1] != "$":
				count += check(i + 1, j + 1, farm[i + 1][j + 1])
				
	print count