from collections import deque


queue = [deque() for _ in range(4)]
queue[0].append("A")
queue[1].append("B")
queue[2].append("C")
queue[3].append("D")
queue[0].append("E")
k = int(input())
for i in range(k):
    queue[(i + 1) % 4].append(queue[i % 4].popleft())
for i in range(4):
    print(*queue[i], sep="")