Harryxun/testdata huggingface dataset:
Buggy python submission (verdict: Runtime Error):
x, y = map(int, input().split())
mod = 1000000007
class Combination:
    """
    O(n)の前計算を1回行うことで，O(1)でnCr mod mを求められる
    n_max = 10**6のとき前処理は約950ms (PyPyなら約340ms, 10**7で約1800ms)
    使用例：
    comb = Combination(1000000)
    print(comb(5, 3))  # 10
    """
    def __init__(self, n_max, mod=10**9+7):
        self.mod = mod
        self.modinv = self.make_modinv_list(n_max)
        self.fac, self.facinv = self.make_factorial_list(n_max)

    def __call__(self, n, r):
        return self.fac[n] * self.facinv[r] % self.mod * self.facinv[n-r] % self.mod

    def make_factorial_list(self, n):
        # 階乗のリストと階乗のmod逆元のリストを返す O(n)
        # self.make_modinv_list()が先に実行されている必要がある
        fac = [1]
        facinv = [1]
        for i in range(1, n+1):
            fac.append(fac[i-1] * i % self.mod)
            facinv.append(facinv[i-1] * self.modinv[i] % self.mod)
        return fac, facinv

    def make_modinv_list(self, n):
        # 0からnまでのmod逆元のリストを返す O(n)
        modinv = [0] * (n+1)
        modinv[1] = 1
        for i in range(2, n+1):
            modinv[i] = self.mod - self.mod//i * modinv[self.mod%i] % self.mod
        return modinv
if (x + y) % 3 != 0:
  print(0)
else:
  n = (x + y) // 3
  nx = x - n
  comb = Combination(n)
  print(comb(n, nx))

Fixed submission:
x, y = map(int, input().split())
mod = 1000000007
class Combination:
    """
    O(n)の前計算を1回行うことで，O(1)でnCr mod mを求められる
    n_max = 10**6のとき前処理は約950ms (PyPyなら約340ms, 10**7で約1800ms)
    使用例：
    comb = Combination(1000000)
    print(comb(5, 3))  # 10
    """
    def __init__(self, n_max, mod=10**9+7):
        self.mod = mod
        self.modinv = self.make_modinv_list(n_max)
        self.fac, self.facinv = self.make_factorial_list(n_max)

    def __call__(self, n, r):
        return self.fac[n] * self.facinv[r] % self.mod * self.facinv[n-r] % self.mod

    def make_factorial_list(self, n):
        # 階乗のリストと階乗のmod逆元のリストを返す O(n)
        # self.make_modinv_list()が先に実行されている必要がある
        fac = [1]
        facinv = [1]
        for i in range(1, n+1):
            fac.append(fac[i-1] * i % self.mod)
            facinv.append(facinv[i-1] * self.modinv[i] % self.mod)
        return fac, facinv

    def make_modinv_list(self, n):
        # 0からnまでのmod逆元のリストを返す O(n)
        modinv = [0] * (n+1)
        modinv[1] = 1
        for i in range(2, n+1):
            modinv[i] = self.mod - self.mod//i * modinv[self.mod%i] % self.mod
        return modinv
if (x + y) % 3 != 0:
  print(0)
else:
  n = (x + y) // 3
  if n > x or n > y:
    print(0)
  else:
    nx = x - n
    comb = Combination(n)
    print(comb(n, nx))
Buggy python submission (verdict: Time Limit Exceeded):
def make_divisors(n):
    divisors = []
    for i in range(1, int(n**0.5)+1):
        if n % i == 0:
            divisors.append(i)
            if i != n // i:
                divisors.append(n//i)

    # divisors.sort()
    return divisors

n = int(input())
a = list(map(int, input().split()))
b = []
lst = [0] * n
for i, x in reversed(list(enumerate(a))):
  if lst[i] % 2 != x:
    for y in make_divisors(i+1):
      lst[y-1] += 1
    b.append(i+1)
print(len(b))
if len(b) > 0:
  print(*reversed(b))

Fixed submission:
n = int(input())
a = list(map(int, input().split()))
b = []
lst = [0] * n
for i, x in reversed(list(enumerate(a))):
  if sum(lst[i::i+1]) % 2 != x:
    lst[i] += 1
    b.append(i+1)
print(len(b))
if len(b) > 0:
  print(*reversed(b))
Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
a = list(map(int, input().split()))
r = []
tmp = [2 * k + 1 for k in range(n//2)]
c = 0
for j in range(n):
  if j in tmp:
    c -= a[j]
  else:
    c += a[j]
r.append(c)
for i in range(n-1):
  r.append((a[i] - r[i] // 2) * 2)
print(*r)

Fixed submission:
n = int(input())
a = list(map(int, input().split()))
r = []
c = 0
for j in range(n):
  if j % 2 == 1:
    c -= a[j]
  else:
    c += a[j]
r.append(c)
for i in range(n-1):
  r.append((a[i] - r[i] // 2) * 2)
print(*r)

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
a = list(map(int, input().split()))
r = []
for i in range(n):
  tmp = [(i + 2 * k + 1) % n for k in range(n//2)]
  c = 0
  for j in range(n):
    if j in tmp:
      c -= a[j]
    else:
      c += a[j]
  r.append(c)
print(*r)

Fixed submission:
n = int(input())
a = list(map(int, input().split()))
r = []
c = 0
for j in range(n):
  if j % 2 == 1:
    c -= a[j]
  else:
    c += a[j]
r.append(c)
for i in range(n-1):
  r.append((a[i] - r[i] // 2) * 2)
print(*r)

Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np

n = int(input())
a = np.asarray(list(map(int, input().split())))
inv = np.asarray([[-1 if j in [(i + 2 * k + 1) % n for k in range(n//2)] else 1 for j in range(n)] for i in range(n)])
print(*np.dot(inv, a))

Fixed submission:
n = int(input())
a = list(map(int, input().split()))
r = []
c = 0
for j in range(n):
  if j % 2 == 1:
    c -= a[j]
  else:
    c += a[j]
r.append(c)
for i in range(n-1):
  r.append((a[i] - r[i] // 2) * 2)
print(*r)
Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
r = [1]
mod = 1000000007
a = [int(input())]

for i in range(n):
  if i == a[-1] - 1:
    if len(a) < m:
      a.append(int(input()))
    r.append(0)
  elif i == 0:
    r.append(1)
  else:
    r.append((r[i] + r[i-1]) % mod)
print(r[-1])

Fixed submission:
n, m = map(int, input().split())
r = [0, 1]
mod = 1000000007
a = []
for i in range(m):
  a.append(int(input()))
j = 0
for i in range(n):
  if j < m and i == a[j] - 1:
    r = [r[1], 0]
    j += 1
  else:
    r = [r[1], (r[0] + r[1]) % mod]
print(r[-1])
Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
a = list(map(int, input().split()))
for i in range(m):
  b, c = map(int, input().split())
  a += [c] * b
a = sorted(a)
print(sum(a[-n:]))


Fixed submission:
from heapq import heappop, heappush

n, m = map(int, input().split())
a = list(map(int, input().split()))
q = []
for x in a:
  heappush(q, [-x, 1])
for i in range(m):
  b, c = map(int, input().split())
  heappush(q, [-c, b])
r = []
k = 0
while k < n:
  c, b = heappop(q)
  c = -c
  r += [c] * b
  k += b
print(sum(r[:n]))

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
a = list(map(int, input().split()))
for i in range(m):
  b, c = map(int, input().split())
  if min(a) < c:
    a += [c] * b
    a.sort()
    a = a[-n:]
print(sum(a))

Fixed submission:
from heapq import heappop, heappush

n, m = map(int, input().split())
a = list(map(int, input().split()))
q = []
for x in a:
  heappush(q, [-x, 1])
for i in range(m):
  b, c = map(int, input().split())
  heappush(q, [-c, b])
r = []
k = 0
while k < n:
  c, b = heappop(q)
  c = -c
  r += [c] * b
  k += b
print(sum(r[:n]))

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
a = list(map(int, input().split()))
for i in range(m):
  b, c = map(int, input().split())
  a += [c] * b
a.sort()
print(sum(a[-n:]))

Fixed submission:
from heapq import heappop, heappush

n, m = map(int, input().split())
a = list(map(int, input().split()))
q = []
for x in a:
  heappush(q, [-x, 1])
for i in range(m):
  b, c = map(int, input().split())
  heappush(q, [-c, b])
r = []
k = 0
while k < n:
  c, b = heappop(q)
  c = -c
  r += [c] * b
  k += b
print(sum(r[:n]))
Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
s = input()
r = min(s.count('#'), s.count('.'))
for i in range(n-1):
  r = min(r, s[:i+1].count('#') + s[i+1:].count('.')) 
print(r)

Fixed submission:
n = int(input())
s = input()
w = s.count('.')
b = 0
r = w 
for i, x in enumerate(s):
  if x == '#':
    b += 1
  else:
    w -= 1
    r = min(r, b + w)
print(r)
Buggy python submission (verdict: Runtime Error):
arr = input().split(" ")
a, b, n = int(arr[0]), int(arr[1]), int(arr[2])
if b<=n:
  k = a
else:
  k = (a*((n-1))//b
print(k)

Fixed submission:
arr = input().split(" ")
a, b, n = int(arr[0]), int(arr[1]), int(arr[2])
if b<=n:
   k = int((a*(b-1))/b)
else:
   k = int((a*n)/b)
print(k)
Buggy python submission (verdict: Runtime Error):
S = input()
Y = input()
if Y = S[:+1]:
  print("Yes")
  else:
    print("No")

Fixed submission:
s = input()
t = input()
if s == t[:-1]:
    print("Yes")
else:
    print("No")
Buggy python submission (verdict: Runtime Error):
X = list(input().split())
if X.count("5") == 2 and X.count("7") == 1:
  print("YES")
  else print("NO")

Fixed submission:
X = list(input().split())
if X.count("5") == 2 and X.count("7") == 1:
    print("YES")
else:
    print("NO")
Buggy python submission (verdict: Runtime Error):
a, b = map(int, input().split())
if ((a*b)%2 == 0)
  print("Odd")
else
  print("Even")

Fixed submission:
a, b = map(int, input().split())
if (a*b) % 2:
    print("Odd")
else:
    print("Even")

Buggy python submission (verdict: Runtime Error):
a, b = map(int, input().split())
if ((a*b)%2 == 0)
  print("Odd")
else
  print("Even")

Fixed submission:
a, b = map(int, input().split())
if (a*b) % 2:
    print("Odd")
else:
    print("Even")
Buggy python submission (verdict: Runtime Error):
S = input()
T = input()

if S.length < 1 || 10 < S.length:
  return 'No'
elif S.length+1 == T.length:
  if S+T[T.length-1] == T:
    return 'Yes'
  else:
    return 'No'
else:
  return 'No'

Fixed submission:
S = input()
T = input()

if len(S) < 1 or 10 < len(S):
  print('No')
elif len(S)+1 == len(T):
  if S+T[len(T)-1] == T:
    print('Yes')
  else:
    print('No')
else:
  print('No')

Buggy python submission (verdict: Runtime Error):
S = input()
T = input()

if (S.length < 1 || 10 < S.length):
  return 'No'
elif (S.length+1 == T.length):
  if (S+T[T.length-1] == T):
    return 'Yes'
  else:
    return 'No'
else:
  return 'No'

Fixed submission:
S = input()
T = input()

if len(S) < 1 or 10 < len(S):
  print('No')
elif len(S)+1 == len(T):
  if S+T[len(T)-1] == T:
    print('Yes')
  else:
    print('No')
else:
  print('No')
Buggy python submission (verdict: Runtime Error):
S = input().split()
A = S[0]
B = S[1]
C = S[2]
K = S[3]

if K <= A:
  print(K)
elif K-A <= B:
  print(K)
else:
  print(K-C)

Fixed submission:
S = list(map(int,input().split()))
A = S[0]
B = S[1]
C = S[2]
K = S[3]

if K <= A:
  print(K)
elif K <= A+B:
  print(A)
else:
  print(A-(K-A-B))

Buggy python submission (verdict: Runtime Error):
S = input().split(' ')
A = S[0]
B = S[1]
C = S[2]
K = S[3]

if K <= A:
  print(K)
elif K-A <= B:
  print(K)
else:
  print(K-C)

Fixed submission:
S = list(map(int,input().split()))
A = S[0]
B = S[1]
C = S[2]
K = S[3]

if K <= A:
  print(K)
elif K <= A+B:
  print(A)
else:
  print(A-(K-A-B))
Buggy python submission (verdict: Runtime Error):
c = input()

p = {}
p["A"] = "T"
p["G"] = "C"

print(p[c])

Fixed submission:
c = input()

p = {}
p["A"] = "T"
p["G"] = "C"
p["T"] = "A"
p["C"] = "G"

print(p[c])
Buggy python submission (verdict: Runtime Error):
# -*- coding: utf-8 -*-
import sys

class YearNumberJudger:

    def __init__(self):
        self.input_num_list = []

    def input(self, num):
        self.input_num_list.append(num)

    def result(self):
        if len(self.input_num_list) != 4:
            return 'NO'
        input_map = {}
        for num in self.input_num_list:
            input_map[num] = True
        if 1 not in input_map:
            return 'NO'
        if 9 not in input_map:
            return 'NO'
        if 7 not in input_map:
            return 'NO'
        if 4 not in input_map:
            return 'NO'
        return 'YES'

if __name__ == "__main__":
    year_number_judger = YearNumberJudger()
    for i in range(4):
        num = int(input())
        year_number_judger.input(num)
    print(year_number_judger.result())


Fixed submission:
# -*- coding: utf-8 -*-
import sys

class YearNumberJudger:

    def __init__(self):
        self.input_num_list = []

    def input(self, num):
        self.input_num_list.append(num)

    def result(self):
        if len(self.input_num_list) != 4:
            return 'NO'
        input_map = {}
        for num in self.input_num_list:
            input_map[num] = True
        if 1 not in input_map:
            return 'NO'
        if 9 not in input_map:
            return 'NO'
        if 7 not in input_map:
            return 'NO'
        if 4 not in input_map:
            return 'NO'
        return 'YES'

year_number_judger = YearNumberJudger()
num_list = list(map(int,input().split()))

for num in num_list:
    year_number_judger.input(num)

print(year_number_judger.result())
Buggy python submission (verdict: Runtime Error):
a, b, c, k = map(int, input().split())

if k <= a:
    sum = k * 1
elif a < k and k <= a + b:
    sum = a
elif a + b < k <= a + b + c:
    sum = a + (-1) * (k - a - b)

print(sum)


Fixed submission:
s = input()
t = input()

if (s[:len(s)] == t[:len(s)]):
    print("Yes")
else:
    print("No")

Buggy python submission (verdict: Runtime Error):
import numpy as np

a, b, c, k = map(int, input().split())

if k <= a:
    sum = k * 1
elif a < k and k <= a + b:
    sum = a
elif a + b < k <= a + b + c:
    sum = a + (-1) * (k - a - b)

print(sum)


Fixed submission:
s = input()
t = input()

if (s[:len(s)] == t[:len(s)]):
    print("Yes")
else:
    print("No")

Buggy python submission (verdict: Runtime Error):
s, t = map(str, input().split())

if (s[:len(s)] == t[:len(s)]):
    print("Yes")
else:
    print("No")


Fixed submission:
s = input()
t = input()

if (s[:len(s)] == t[:len(s)]):
    print("Yes")
else:
    print("No")
Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np

a, b, c, k = map(int, input().split())

ones = [1 for i in range(a)]
zeros = [0 for i in range(b)]
minusOnes = [-1 for i in range(c)]

combination = np.array(ones + zeros + minusOnes)
sum = 0
for i in range(k):
    sum += combination[i]
print(sum)


Fixed submission:
a, b, c, k = map(int, input().split())

if k <= a:
    sum = k * 1
elif a < k and k <= a + b:
    sum = a
elif a + b < k <= a + b + c:
    sum = a + (-1) * (k - a - b)

print(sum)
Buggy python submission (verdict: Runtime Error):
a, b = input().split()
complete = a * b;
tmp = complete
for i in range(1, min(a, b) + 1):
    tmp /= i
    if tmp % b == 0 and tmp % a == 0:
        complete = tmp

print(complete)


Fixed submission:
a, b = input().split()
product = int(a) * int(b);
complete = product
tmp = product
for i in range(2, min(int(a), int(b)) + 1):
    tmp = product / i
    if tmp % int(b) == 0 and tmp % int(a) == 0:
        complete = tmp
print(int(complete))
Buggy python submission (verdict: Runtime Error):
	S = input()
	T = input()
	if S == T[:-1]:
		print("Yes")
	else:
		print("No")

Fixed submission:
S = input()
T = input()
if S == T[:-1]:
	print("Yes")
else:
	print("No")
Buggy python submission (verdict: Runtime Error):
A,B,C,K = map(int, input().split())
if A >= K:
	print(K)
	return
K -= A
if B >= K:
	print(A)
	return
K -= B
print(A - K)

Fixed submission:
A,B,C,K = map(int, input().split())
if A >= K:
	print(K)
	exit()
K -= A
if B >= K:
	print(A)
	exit()
K -= B
print(A - K)
Buggy python submission (verdict: Runtime Error):
n,k=map(int,input().split(' '))
a=list(1 for i in range(n+1))
for z in range(k):
  x=int(input())
  temp=map(int,input.split(' '))
  for i in temp:
    a[i]+=1
    c=0
for i in range(1,n+1):
  if(a[i]==0):
    c++
print(c)

Fixed submission:
n,k=map(int,input().split(' '))
a=[0 for i in range(n+1)]
for z in range(k):
  x=int(input())
  temp=map(int,input().split(' '))
  for i in temp:
    a[i]+=1
c=0
for i in range(1,n+1):
  if(a[i]==0):
    c+=1
print(c)

Buggy python submission (verdict: Runtime Error):
n,k=map(int,input().split(' '))
a=list(1 for i in range(n+1))
for z in range(k):
  x=int(input())
  temp=map(int,input.split(' '))
  for i in temp:
    a[i]+=1
c=0
for i in range(1,n+1):
  if(a[i]==0):
    c++
print(c)

Fixed submission:
n,k=map(int,input().split(' '))
a=[0 for i in range(n+1)]
for z in range(k):
  x=int(input())
  temp=map(int,input().split(' '))
  for i in temp:
    a[i]+=1
c=0
for i in range(1,n+1):
  if(a[i]==0):
    c+=1
print(c)
Buggy python submission (verdict: Runtime Error):
A,B,C =map(int,input().split())

if A =< C =< B:
  print('Yes')
  
  else:
    print('No')

Fixed submission:
# 3  つの整数  A , B , C  が与えられます。 
# 整数  C  が  A  以上 かつ  B  以下であるかを判定してください。
A,B,C =map(int,input().split())
 
if C>=A and C<=B:
	print('Yes')
else:
	print('No')
Buggy python submission (verdict: Time Limit Exceeded):
import collections
n = int(input())

d = {}
ans = []

for i in range(n):
    a = input()
    if a in d:
        d[a] += 1
    else:
        d[a] = 1

ans = [j[0] for j in d.items() if j[1] == max(d.values())]

ans.sort()

print('\n'.join(map(str, ans)))

Fixed submission:
n = int(input())

d = {}

for i in range(n):
    a = input()
    if a in d:
        d[a] += 1
    else:
        d[a] = 1

m = max(d.values())
d = sorted(d.items())

for j in d:
    if j[1] == m:
        print(j[0])

Buggy python submission (verdict: Time Limit Exceeded):
import collections
n = int(input())
l = [input() for i in range(n)]
ans = []


c = collections.Counter(l)

ans = [j[0] for j in c.items() if j[1] == max(c.values())]

ans.sort()

print('\n'.join(map(str, ans)))

Fixed submission:
n = int(input())

d = {}

for i in range(n):
    a = input()
    if a in d:
        d[a] += 1
    else:
        d[a] = 1

m = max(d.values())
d = sorted(d.items())

for j in d:
    if j[1] == m:
        print(j[0])

Buggy python submission (verdict: Time Limit Exceeded):
import collections
n = int(input())
l = []
ans = []

for i in range(n):
    l.append(input())

c = collections.Counter(l)

ans = [i[0] for i in c.items() if i[1] == max(c.values())]

ans.sort()

print('\n'.join(map(str, ans)))

Fixed submission:
n = int(input())

d = {}

for i in range(n):
    a = input()
    if a in d:
        d[a] += 1
    else:
        d[a] = 1

m = max(d.values())
d = sorted(d.items())

for j in d:
    if j[1] == m:
        print(j[0])

Buggy python submission (verdict: Time Limit Exceeded):
import collections
n = int(input())
l = []
ans = []

for i in range(n):
    l.append(input())

c = collections.Counter(l)

ans.append(c.most_common()[0][0])

for i in range(1, len(c)):
    if c.most_common()[0][1] == c.most_common()[i][1]:
        ans.append(c.most_common()[i][0])
    else:
        break

ans.sort()

print('\n'.join(map(str, ans)))

Fixed submission:
n = int(input())

d = {}

for i in range(n):
    a = input()
    if a in d:
        d[a] += 1
    else:
        d[a] = 1

m = max(d.values())
d = sorted(d.items())

for j in d:
    if j[1] == m:
        print(j[0])
Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())

L = 1
R = 10**5

for i in range(m):
    l, r = map(int, input().split())
    if L <= l <= R:
        L = l
    if L <= r <= R:
        R = r
    if R < l or r < L:
        ans = 0
        break

if ans != 0:
    ans = R - L + 1

print(ans)

Fixed submission:
n, m = map(int, input().split())

L = 1
R = 10**5
ans = 1

for i in range(m):
    l, r = map(int, input().split())
    if L <= l <= R:
        L = l
    if L <= r <= R:
        R = r
    if R < l or r < L:
        ans = 0
        break

if ans != 0:
    ans = R - L + 1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
l = [list(map(int, input().split())) for i in range(m)]
ans = 0

for j in range(1, n+1):
    flag = True
    for k in range(m):
        if l[k][0] <= j <= l[k][1]:
            continue
        else:
            flag = False
            break
    if flag:
        ans += 1

print(ans)


Fixed submission:
n, m = map(int, input().split())

L = 1
R = 10**5
ans = 1

for i in range(m):
    l, r = map(int, input().split())
    if L <= l <= R:
        L = l
    if L <= r <= R:
        R = r
    if R < l or r < L:
        ans = 0
        break

if ans != 0:
    ans = R - L + 1

print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
s = input()
l = len(s)

while True:
    if s.count('0') == 0 or s.count('1') == 0:
        break
    elif 4 <= len(s):
        s = s.replace('0011', '')
        s = s.replace('1010', '')
        s = s.replace('0101', '')
        s = s.replace('1100', '')
    else:
        s = s.replace('01', '')
        s = s.replace('10', '')

print(l - len(s))

Fixed submission:
s = input()
one = s.count('1')
zero = s.count('0')

print(len(s) - abs(one - zero))
Buggy python submission (verdict: Time Limit Exceeded):
n, k = map(int, input().split())
h = sorted([int(input()) for x in range(n)])
d = 10 ** 9

for i in range(n-k+1):
    l = h[i:i+k]
    d = min(d, max(l) - min(l))

    if d == 0:
        break

print(d)

Fixed submission:
n, k = map(int, input().split())
h = sorted([int(input()) for x in range(n)])
d = 10**9

for i in range(n-k+1):
    d = min(d, h[i+k-1] - h[i])

    if d == 0:
        break

print(d)
Buggy python submission (verdict: Runtime Error):
n = list(input())
ans = 0

a = (len(n) - 1) * 9 + int(n[0]) - 1

if a < sum(map(int, n)):
    ans = sum(n)
else:
    ans = a

print(ans)

Fixed submission:
n = list(input())
ans = 0

a = (len(n) - 1) * 9 + int(n[0]) - 1

if a < sum(map(int, n)):
    ans = sum(map(int, n))
else:
    ans = a

print(ans)
Buggy python submission (verdict: Runtime Error):
S = list(input())
s = sorted(list(set(S)))
l = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
     'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

ans = 'None'

for i in range(26):
    if s[i] != l[i]:
        ans = l[i]
        break

print(ans)

Fixed submission:
S = list(input())
s = sorted(list(set(S)))
l = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
     'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

if s == l:
    ans = 'None'
else:
    for i in range(26):
        if (len(s) - 1) < i:
            ans = l[i]
            break
        elif s[i] != l[i]:
            ans = l[i]
            break

print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
a, b = list(map(int, input().split()))
p = 1

while True:
    p *= a
    a += 1

    if b < a:
        break

if 0 < p:
    print('Positive')
elif p < 0:
    print('Negative')
else:
    print('Zero')

Fixed submission:
a, b = list(map(int, input().split()))
p = 1

if 0 < a and 0 < b:
    print('Positive')
elif a <= 0 and 0 <= b or 0 <= a and b <= 0:
    print('Zero')
else:
    if (b - a + 1) % 2 == 0:
        print('Positive')
    else:
        print('Negative')
Buggy python submission (verdict: Runtime Error):
N = int(input())
K = int(input())
l = []
for k in range(K):
    a = int(input())
    for i in range(a):
        l.append(int(input()))
print(l)
for j in range(N):
    if not j+1 in l:
        print(j+1)

Fixed submission:
N,K=map(int,input().split())
l = []
for k in range(K):
    a = int(input())
    lis=list(map(int,input().split()))
    l.extend(lis)
c=0
for j in range(N):
    if not j+1 in l:
        c+=1
print(c)

Buggy python submission (verdict: Runtime Error):
N=input()
K=input()
l=[]
for k in range(K):
  a=input()
  for i in range(a):
    l.append(input())
  
for j in range(N):
  if j not in l:
    print(j)





Fixed submission:
N,K=map(int,input().split())
l = []
for k in range(K):
    a = int(input())
    lis=list(map(int,input().split()))
    l.extend(lis)
c=0
for j in range(N):
    if not j+1 in l:
        c+=1
print(c)

Buggy python submission (verdict: Runtime Error):
N=input()
K=input()
l=[]
for k in range(K):
  a=input()
  for i in range(a):
    l.append(input())
  
for j in range(N):
  if j != in l:
    print(j)





Fixed submission:
N,K=map(int,input().split())
l = []
for k in range(K):
    a = int(input())
    lis=list(map(int,input().split()))
    l.extend(lis)
c=0
for j in range(N):
    if not j+1 in l:
        c+=1
print(c)