from collections import deque
que = [
    deque(["A", "E"]),
    deque(["B"]),
    deque(["C"]),
    deque(["D"]),
]

K = int(input())
for i in range(K):
    x = que[i % 4].popleft()
    que[(i + 1) % 4].append(x)

for q in que:
    print("".join(q))