D = int(input())
A = list(map(int,input().split()))
B = [-1,0,1]

for i in range(3,D+1)[::-1]:
    p = -A[i]
    for j in range(3):
        A[i-2+j] += B[j]*p

for i in range(min(D,4))[::-1]:
    if A[i] != 0:
        print(i)
        print(*A[:i+1])
        exit()

print(0)
print(0)