class asd29
{
        public static void main(String[] args)
        {
                
                for(int a=1,b=0;a<10;a++)
                {
                        char d ='A';
                        d--;
                        if(a<=10/2)                        
                        {
                                for(int c=0;c<2*a-1;c++)
                                {
                                        if((b<a)&&(b==c))
                                        {
                                                b++;
                                                d++;
                                        }
                                        else
                                        {
                                                b--;
                                                d--;
                                        }
                                        System.out.print(d);        
                                }
                                System.out.println();
                                b=0;
                        }
                        else
                        {
                                for(int c=0;c<-2*a+19;c++)
                                {
                                        if((b<10-a)&&(b==c))
                                        {
                                                b++;
                                                d++;
                                        }
                                        else
                                        {
                                                b--;
                                                d--;
                                        }
                                        System.out.print(d);
                                }        
                                System.out.println();
                                b=0;
                                
                        }
                }
        }
}


'난 정말 자바를 공부한적이 없어요' 보고 공부중인 자바입문자인데 
다이아몬드 모양 어떻게만듬??