a = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R"]
for i in range(10):
    if i == 0 :
       print((''.join(a[i:18])))
       
    if i > 0 :
       print((''.join(a[i::-1]+a[1:18-i])))