#!/usr/bin/env python3

from collections import deque
import sys

def main():
    K = int(input())
    q = [deque(["A", "E"]), deque(["B"]), deque(["C"]), deque(["D"])]
    # print(q)
    for i in range(K):
        q[(i + 1) % 4].append(q[i % 4].popleft())
    for qq in q:
        print(*qq, sep="")
    return

if __name__ == '__main__':
    main()