from collections import deque

qs = [
    deque(["A", "E"]),
    deque(["B"]),
    deque(["C"]),
    deque(["D"]),
]
k = int(input())
for i in range(k):
    qi = i % 4
    nqi = (i + 1) % 4
    qs[nqi].append(qs[qi].popleft())
for q in qs:
    print("".join(q))