import java.util.Scanner;
class pattern
{
public static void main(String ar[])
{
  Scanner scan = new Scanner(System.in);
  System.out.println("Enter the limit or number of lines");
  int limit = scan.nextInt();
  int value = 65;
  for(int i=1; i<=limit; i++){
	  for(int j=1; j<=i; j++){
		  System.out.print((char) value +"\t");
		  value++;
	  }
	  value=65;
	  System.out.println();
	}
}
}