s=input().split()
a=int(ord(s[0])-64)
for i in range(1,2*a,1):
    if i<=a:
        h=1
        while h<=(2*a-2*i+1)/2:
                print(' ',end="")
                h=h+1 
        h=1  
        while h<=2*i-1:
            print(chr(64+i),end='')
            h=h+1
    else:
        h=1
        while h<=i-a:
                print(' ',end="")
                h=h+1 
        h=1  
        while h<=(2*a-i)*2-1:
            print(chr(64+2*a-i),end='')
            h=h+1
    print('')