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

int main(){
int n;
cin >> n;
if (n == 2)
cout <<"A
        BC" <<endl;
if ( n == 3)
cout <<"A
        BC
        DEF"<<endl;
if (n == 4)
cout <<"A
        BC
        DEF
        GHIJ"<<endl;
if ( n == 5)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO"<<endl;
if (n == 6)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU"<<endl;
if ( n == 7)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB"<<endl;
if ( n == 8)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ"<<endl;
if ( n == 9)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ
        KLMNOPQRS"<<endl;
if(i == 10)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ
        KLMNOPQRS"<<endl;
if(i == 11)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ
        KLMNOPQRS
        TUVWXYZABC"<<endl;
if(i == 12)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ
        KLMNOPQRS
        TUVWXYZABC
        DEFGHIJKLMN"<<endl;
if(i == 13)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ
        KLMNOPQRS
        TUVWXYZABC
        DEFGHIJKLMN
        OPQRSTUVWXYZ"<<endl;
if(i == 14)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ
        KLMNOPQRS
        TUVWXYZABC
        DEFGHIJKLMN
        OPQRSTUVWXYZ
        ABCDEFGHIJKLM"<<endl;
if(i == 15)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ
        KLMNOPQRS
        TUVWXYZABC
        DEFGHIJKLMN
        OPQRSTUVWXYZ
        ABCDEFGHIJKLM
        NOPQRSTUVWXYZA"<<endl;
if(i == 16)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ
        KLMNOPQRS
        TUVWXYZABC
        DEFGHIJKLMN
        OPQRSTUVWXYZ
        ABCDEFGHIJKLM
        NOPQRSTUVWXYZA
        BCDEFGHIJKLMNOPQ"<<endl;
if(i == 17)
cout <<"A
        BC
        DEF
        GHIJ
        KLMNO
        PQRSTU
        VWXYZAB
        CDEFGHIJ
        KLMNOPQRS
        TUVWXYZABC
        DEFGHIJKLMN
        OPQRSTUVWXYZ
        ABCDEFGHIJKLM
        NOPQRSTUVWXYZA
        BCDEFGHIJKLMNOPQ
        RSTUVWXYZABCDEFGH"<<endl;
return 0;
}