program abrakadapra;
uses crt;
var
 n,x,i,j,dop2:integer;
 buk,h:string;
begin
 clrscr;
 readln(n);
 i:=26;
 j:=1;
 dop2:=97;
 h:='a';
 writeln;
 writeln(h);
 writeln;
 repeat
  inc(dop2);
  h:=chr(dop2)+h+h;
  writeln(h,' ');
  writeln;
  delay(10000);
  inc(j);
 until j=26;
 writeln('буква ',h[n]);


 readln;
end.