/* 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
	{
        String a = "АбВгДеёжзийклмнопрстуфхцчшщъыьэюя\t\tаыппвыаи\r\nвыаиваыи ваы ивыи\nваиываиа ыва ивыи\nыва иа иваы ив";
        System.out.println(a.toLowerCase().replaceAll("[^а-я]+", ""));
	}
}

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