Buggy python submission (verdict: Runtime Error):
N = int(input())
S = [input() for i in range(N)]
m_count = 0
m_str = []

for i in range(N):
    if S.count(S[i]) > m_count:
        m_str = [S[i]]
        m_count = S.count(S[i])
    elif S.count(S[i]) == m_count:
        m_str.append(S[i])

m_str = list(set(m_str))
m_str.sort()

print(m_str[i] for i in len(m_str))

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
judge = 1
while 0 in A:
    A.remove(0)

A_ = list(set(A))
A_.sort()
for i in range(len(A_) - 1):
    if A_[i+1] == A_[i]+2:
        judge = 1
    else:
        judge = 0

if len(set(A)) == len(A)/2 and judge:
    print((2 ** (len(A) // 2)) % (10**9 +7))
else:
    print(0)

Buggy python submission (verdict: Runtime Error):
N = int(input())
S = [input() for i in range(N)]
m_count = 0
m_str = []

for i in range(N):
    if S.count(S[i]) > m_count:
        m_str = [S[i]]
        m_count = S.count(S[i])
    elif S.count(S[i]) == m_count:
        m_str.append(S[i])

m_str = list(set(m_str))
m_str.sort()

print(m_str[i] for i in len(m_str))

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
judge = 1
while 0 in A:
    A.remove(0)

A_ = list(set(A))
A_.sort()
for i in range(len(A_) - 1):
    if A_[i+1] == A_[i]+2:
        judge = 1
    else:
        judge = 0

if len(set(A)) == len(A)/2 and judge:
    print((2 ** (len(A) // 2)) % (10**9 +7))
else:
    print(0)

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))

while 0 in A:
    A.remove(0)

A_ = list(set(A))
A_.sort()
for i in range(len(A_) - 1):
    if A_[i+1] == A_[i]+2:
        judge = 1
    else:
        judge = 0

if len(set(A)) == len(A)/2 and judge:
    print((2 ** (len(A) // 2)) % (10**9 +7))
else:
    print(0)

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
judge = 1
while 0 in A:
    A.remove(0)

A_ = list(set(A))
A_.sort()
for i in range(len(A_) - 1):
    if A_[i+1] == A_[i]+2:
        judge = 1
    else:
        judge = 0

if len(set(A)) == len(A)/2 and judge:
    print((2 ** (len(A) // 2)) % (10**9 +7))
else:
    print(0)

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))

while 0 in A:
    A.remove(0)

A_ = list(set(A))
A_.sort()
for i in range(len(A_) - 1):
    if A_[i+1] == A_[i]+2:
        judge = 1
    else:
        judge = 0

if len(set(A)) == len(A)/2 and judge:
    print(2 ** (len(A) // 2))
else:
    print(0)

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
judge = 1
while 0 in A:
    A.remove(0)

A_ = list(set(A))
A_.sort()
for i in range(len(A_) - 1):
    if A_[i+1] == A_[i]+2:
        judge = 1
    else:
        judge = 0

if len(set(A)) == len(A)/2 and judge:
    print((2 ** (len(A) // 2)) % (10**9 +7))
else:
    print(0)

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))
judge = 0
while 0 in A:
    A.remove(0)
for i in range(len(set(A))):
    if set(A)[i+1] - set(A)[i] == 2:
        judge = 1
    else:
        judge = 0
        break
if len(set(A)) == len(A)/2 and judge:
    print(2 ** (len(A) // 2))
else:
    print(0)

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
judge = 1
while 0 in A:
    A.remove(0)

A_ = list(set(A))
A_.sort()
for i in range(len(A_) - 1):
    if A_[i+1] == A_[i]+2:
        judge = 1
    else:
        judge = 0

if len(set(A)) == len(A)/2 and judge:
    print((2 ** (len(A) // 2)) % (10**9 +7))
else:
    print(0)