Buggy python submission (verdict: Runtime Error):
n,m = map(int, input().split())
A = [int(input()) for i in range(m)]
B = [A[i+1]- A[i] for i in range(m-1)]
B.insert(0,A[0]+1)
B.append(n+1-A[m-1])

M = max(A)

Fib = [0,1]
for i in range(2,M+10):
  Fib.append(Fib[i-2]+Fib[i-1])

ans = 1
for i in range(len(B)):
  ans = (ans * Fib[B[i]-1])%1000000007
  
print(ans)


Fixed submission:
n,m = map(int, input().split())
A = [int(input()) for i in range(m)]
if m == 0:
  Fib = [1,2]
  for i in range(2,n):
    Fib.append(Fib[i-2]+Fib[i-1])
  print(Fib[n-1]%1000000007)
  exit()

B = [A[i+1]- A[i] for i in range(m-1)]
B.insert(0,A[0]+1)
B.append(n+1-A[m-1])

M = max(A)

Fib = [0,1]
for i in range(2,M+10):
  Fib.append(Fib[i-2]+Fib[i-1])

ans = 1
for i in range(len(B)):
  ans = (ans * Fib[B[i]-1])%1000000007
  
print(ans)

Buggy python submission (verdict: Runtime Error):
n,m = map(int, input().split())
A = [int(input()) for i in range(m)]
B = [A[i+1]- A[i] for i in range(m-1)]
B.insert(0,A[0]+1)
B.append(n+1-A[m-1])

M = max(A)

def Fib(n):
  L = [0,1]
  for i in range(2,n+3):
    L.append(L[i-2]+L[i-1])
  return(L)

ans = 1
for i in range(len(B)):
  ans = ans * Fib(max(A))[B[i]-1]
  ans = ans % 1000000007
  
print(ans)

Fixed submission:
n,m = map(int, input().split())
A = [int(input()) for i in range(m)]
if m == 0:
  Fib = [1,2]
  for i in range(2,n):
    Fib.append(Fib[i-2]+Fib[i-1])
  print(Fib[n-1]%1000000007)
  exit()

B = [A[i+1]- A[i] for i in range(m-1)]
B.insert(0,A[0]+1)
B.append(n+1-A[m-1])

M = max(A)

Fib = [0,1]
for i in range(2,M+10):
  Fib.append(Fib[i-2]+Fib[i-1])

ans = 1
for i in range(len(B)):
  ans = (ans * Fib[B[i]-1])%1000000007
  
print(ans)

Buggy python submission (verdict: Runtime Error):
n,m = map(int, input().split())
A = [int(input()) for i in range(m)]
for i in range(m-1):
  if A[i]+1 == A[i+1]:
    print(0)
    exit()

ANS = [A[0]-0]
for i in range(m-1):
  ANS.append(A[i+1]-A[i]-1)
ANS.append(n-A[m-1])

Fib = [1,1,2]
for i in range(3,max(ANS)+4):
  Fib.append(Fib[i-1]+Fib[i-2])

ans = 1
for i in range(len(ANS)):
  ans = (ans * Fib[ANS[i]-1])%1000000007
  
print(ans)

Fixed submission:
n,m = map(int, input().split())
A = [int(input()) for i in range(m)]
if m == 0:
  Fib = [1,2]
  for i in range(2,n):
    Fib.append(Fib[i-2]+Fib[i-1])
  print(Fib[n-1]%1000000007)
  exit()

B = [A[i+1]- A[i] for i in range(m-1)]
B.insert(0,A[0]+1)
B.append(n+1-A[m-1])

M = max(A)

Fib = [0,1]
for i in range(2,M+10):
  Fib.append(Fib[i-2]+Fib[i-1])

ans = 1
for i in range(len(B)):
  ans = (ans * Fib[B[i]-1])%1000000007
  
print(ans)

Buggy python submission (verdict: Runtime Error):
n,m = map(int, input().split())
A = [int(input()) for i in range(m)]
for i in range(m-1):
  if A[i]+1 == A[i+1]:
    print(0)
    exit()

ANS = [A[0]-0]
for i in range(m-1):
  ANS.append(A[i+1]-A[i]-1)
ANS.append(n-A[m-1])

Fib = [1,1,2]
for i in range(3,max(ANS)+4):
  Fib.append(Fib[i-1]+Fib[i-2])

print(Fib)
print(ANS)
ans = 1
for i in range(len(ANS)):
  ans = (ans * Fib[ANS[i]-1])%1000000007
  
print(ans)

Fixed submission:
n,m = map(int, input().split())
A = [int(input()) for i in range(m)]
if m == 0:
  Fib = [1,2]
  for i in range(2,n):
    Fib.append(Fib[i-2]+Fib[i-1])
  print(Fib[n-1]%1000000007)
  exit()

B = [A[i+1]- A[i] for i in range(m-1)]
B.insert(0,A[0]+1)
B.append(n+1-A[m-1])

M = max(A)

Fib = [0,1]
for i in range(2,M+10):
  Fib.append(Fib[i-2]+Fib[i-1])

ans = 1
for i in range(len(B)):
  ans = (ans * Fib[B[i]-1])%1000000007
  
print(ans)