import random

LENGTH=1

print(LENGTH)
for _ in range(LENGTH):
    n = random.randint(1, 200000)
    n = 200000
    print(n)
    root = random.randint(1, n)
    l = []
    for i in range(n):
        if i==root:
            l.append(str(root))
        else:
            j = i
            while i==j:
                j=random.randint(1, n)
            l.append(str(j))

    print(" ".join(l))