import sys
input = sys.stdin.readline
from collections import deque

Q=[deque(["A","E"]),deque(["B"]),deque(["C"]),deque(["D"])]


K=int(input())
for i in range(K):
    j=i%4
    k=(i+1)%4

    x=Q[j].popleft()
    Q[k].append(x)

for i in range(4):
    print("".join(Q[i]))