import java.util.*;
class Pattern {
public static void main(String[] args)
{
Scanner sc= new Scanner(System.in);
System.out.print("enter the value of row =");
int n=sc.nextInt();
for(int i=1; i<=n; i++){
for(int j=1; j<=n+1-i; j++){
System.out.print((char)(j+64)+" ");
}
System.out.println();
}
}
}
