***#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
cin>>n;
for(int i=1;i<=n;i++){
if(i==1){
cout<<"A"<<endl;
}
if(i==2){
cout<<"BAB"<<endl;
}
if(i==3){
cout<<"CBABC"<<endl;
}
if(i==4){
cout<<"DCBABCD"<<endl;
}
if(i==5){
cout<<"EDCBABCDE"<<endl;
}
if(i==6){
cout<<"FEDCBABCDEF"<<endl;
}
if(i==7){
cout<<"GFEDCBABCDEFG"<<endl;
}
if(i==8){
cout<<"HGFEDCBABCDEFGH"<<endl;
}
if(i==9){
cout<<"IHGFEDCBABCDEFGHI"<<endl;
}
if(i==10){
cout<<"JIHGFEDCBABCDEFGHIJ"<<endl;
}
if(i==11){
cout<<"KJIHGFEDCBABCDEFGHIJK"<<endl;
}
if(i==12){
cout<<"LKJIHGFEDCBABCDEFGHIJKL"<<endl;
}
if(i==13){
cout<<"MLKJIHGFEDCBABCDEFGHIJKLM"<<endl;
}
if(i==14){
cout<<"NMLKJIHGFEDCBABCDEFGHIJKLMN"<<endl;
}
if(i==15){
cout<<"ONMLKJIHGFEDCBABCDEFGHIJKLMNO"<<endl;
}
if(i==16){
cout<<"PONMLKJIHGFEDCBABCDEFGHIJKLMNOP"<<endl;
}
if(i==17){
cout<<"QPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQ"<<endl;
}
if(i==18){
cout<<"RQPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQR"<<endl;
}
if(i==19){
cout<<"SRQPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQRS"<<endl;
}
if(i==20){
cout<<"TSRQPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQRST"<<endl;
}
if(i==21){
cout<<"UTSRQPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQRSTU"<<endl;
}
if(i==22){
cout<<"VUTSRQPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQRSTUV"<<endl;
}
if(i==23){
cout<<"WVUTSRQPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQRSTUVW"<<endl;
}
if(i==24){
cout<<"XWVUTSRQPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQRSTUVWX"<<endl;
}
if(i==25){
cout<<"YXWVUTSRQPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQRSTUVWXY"<<endl;
}
if(i==26){
cout<<"ZYXWVUTSRQPONMLKJIHGFEDCBABCDEFGHIJKLMNOPQRSTUVWXYZ"<<endl;
}
}

}***

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n,a=65,x=1;cin>>n;char A='A';
    int zhengdekeng=n;
    for(int i=1;i<=n;i++)
    {
        cout<<setw(zhengdekeng--);
        a=65+i-1;
        for(int j=1;j<=i*2-1;j++)
        {   
            if(a==65+i-1)
            x=0;
            if(char(a)=='A')
            x=1;
            cout<<char(a);
            if(x==1)
            a++;
            else a--;
        }
        cout<<endl;
    }
    return 0;
}