# https://yukicoder.me/problems/no/3623
 


def main():
    answer = []
    # 1巡目
    for s in range(26):
        answer.append((s, s))
        if s < 13:
            answer.append((s, s + 13))
            answer.append((s + 13, s))

        if s < 2:
            for d in range(2, 26, 2):
                for j in range(13):
                    s_ = (s + d * j) % 26
                    t_ = (s + d * (j + 1)) % 26
                    answer.append((s_, t_))
        answer.append((s, (s + 1) % 26))

    s = 0
    for d in range(2, 26):
        if d % 2 != 0 and d % 13 != 0:
            for j in range(26):
                s_ = (s + d * j) % 26
                t_ = (s + d * (j + 1)) % 26
                answer.append((s_, t_))
    
    for a in answer:
        a0 = ""
        a0 += chr(a[0] + ord("A"))        
        a0 += chr(a[1] + ord("A"))        
        print(a0)







if __name__ == "__main__":
    main()