f = input()
K = int(f.split()[0])

q = [['A','E'],['B'],['C'],['D']]

for i in range(K):
    j = i % 4
    q[(j+1)%4].append(q[i][0])
    del q[i][0]
for i in range(4):
    for j in range(len(q[i])):
        print(q[i][j],end="")
    print()