import java.util.Scanner;

public class Runner
{
    public static void print(int height){
        int a = height;
        for (int lines = 0; lines < a; lines++, height--)
        {
            if(height%2 == 0){
                System.out.print("BB");
            }
            else if(height%2 == 1){
                System.out.print("AA");
            }
        }
    }
    public static void main(String[] args)
    {
        int a, b, lines, height; // enter variables
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter height of the pattern: ");
        a = height = sc.nextInt();

        for(int i=0; i<height; i++){
            print(i+1);
            System.out.println();
        }
        
        
    }
}

import java.util.Scanner;


//Declare your class here
public class Runner {

    //Create the class to create each iteration of height
    public static void print(int height){
        //Set the INTEGER "a" set to the value of "height".
        int a = height;
        /************************************
        **Start LOOP
        **Start of by setting "lines" = 0
        **As log as lines is smaller then a keep looping
        **Once the loop is started, increase the value of "lines" for each iteration
        **Also you need to decrese the value of "height", meaning the 1st level is
        **done so when it starts again it will start at the next level
        **This is where you get the AABBAA, which is the "HORIZIONAL" height.
        **Meaning level 1 is AA, 2 is AABB, 3 is AABBAA, and so on.
        **Once "lines" is equal to "a", stop looping
        ************************************/
        for (int lines = 0; lines < a; lines++, height--){
            //If the instance is on an even, then print out "BB"
            if(height%2 == 0){
                System.out.print("BB");
            }
            //If the instance is on an odd, then print out "AA"
            else if(height%2 == 1){
                System.out.print("AA");
            }
        }
    }
    //main class, a MUST to run a JAVA App
    public static void main(String[] args)
    {
        //Declare local variables
        int a, b, lines, height;
        //Set up main to recieve the users inputed data
        Scanner sc = new Scanner(System.in);
        //Message printed out to user giving directions on what to do
        System.out.print("Enter height of the pattern: ");
        //assigns the int a to height and then points to the value recieved from the user
        a = height = sc.nextInt();
        /*****************************************
        **loop for each level
        **This is where the "VERTICAL" height is applied.
        **Example
        **AA
        **AABB
        **AABBAA
        **And so on
        ******************************************/
        for(int i=0; i<height; i++){
            print(i+1);
            System.out.println();
        }
        
        
    }
}

    String str = "";
        
    for(int i = 0; i < height; i++) {
        if(i % 2 == 0)
            str = "AA" + str;
        else
            str = "BB" + str;
        System.out.println(str);
    }