/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		for(int i=1;i<10;i++){
            for(int j=1;j<10;j++){
                if(j <= i){
                    System.out.print("■");
                }else{
                    System.out.print("□");
                }                    
            }
            System.out.println();
        }
	}
}

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