/* 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 myString = "my 2 first gifts were made by my 4 brothers";
    myString = myString .replaceAll("\\D+","");
    System.out.println("myString : " + myString);
	}
}