import java.util.Random;

public class bgen
{
	public static void main(String Args[]) throws Exception
	{
		Random R=new Random();

		for(int i=0; i<30; i++)
		{
			int z='A' + R.nextInt(26);
			char x=(char)z;
			System.out.print(x);


		}
		System.out.println();



	}


}