/* 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 input = " this*is#a*&very_dirty&String" ; 
String onlyLetters = 
        input 
        .codePoints()
        .filter(
            codePoint -> Character.isLetter( codePoint ) 
        )
        .collect(               
            StringBuilder :: new ,        
            StringBuilder :: appendCodePoint , 
            StringBuilder :: append    
        )        
        .toString() 
;
 
System.out.println( onlyLetters ) ;
 
	}
}

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