import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner in = new Scanner(System.in);
		String sin = in.nextLine();
		StringBuffer str = new StringBuffer(sin);
		char si;
		for (int i=0; i<str.length(); i++){
			si=str.charAt(i);
		    if ((si>='a'&&si<='z')||(si>='A'&&si<='Z')){
		        str.deleteCharAt(i); i--;
		    }
		}
		System.out.printf("%s",str);
	}
}

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