D = int(input())
A = list(map(int, input().split()))
def f(x):
    ans = 0
    x0 = x
    x = 1
    for i in range(D + 1):
        ans += A[i] * x
        x *= x0
    return ans
# a - b + c = f(-1)
# c = f(0)
# a + b + c = f(1)
c = f(0)
a = (f(-1) + f(1) - 2 * c) // 2
b = (f(1) - f(-1)) // 2
if a == 0:
    if b == 0:
        print(0)
        print(c)
    else:
        print(1)
        print(c, b)
else:
    print(2)
    print(c, b, a)