from collections import deque


a=deque('A')
b=deque('B')
c=deque('C')
d=deque('D')
a.append('E')
dic={0:a,1:b,2:c,3:d}
k=int(input())

for i in range(1,k+1):
    if len(dic[(i-1)%4]) == 0:
        continue
    dic[i%4].append(dic[(i-1)%4].popleft())

for i in range(4):
    print(''.join(dic[i]))