import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;


public class Hello_Java{
	public static void main(String[] args){
		Scanner input = new Scanner(System.in);
		String s = input.nextLine();
		ArrayList<Integer> numbers = new ArrayList<Integer>();
		List<String> letters = new ArrayList<String>(Arrays.asList(s.split(" ")));
			for (int i = 0; i < letters.size(); i++) {
				if (getValue(letters.get(i))) {
					numbers.add(Integer.parseInt(letters.get(i)));
					}
				else {
					continue;
				}
			}
		System.out.println(Arrays.asList(numbers));
	}
	public static boolean getValue(ArrayList<String> letters.get(i) ){
		try
	     {
	         Integer.parseInt(letters.get(i));
	         return true;
	      } catch(NumberFormatException nfe)
	      {
	          return false;
	      }
	}
}