import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int t = in.nextInt();
        int b = in.nextInt();
        int f = in.nextInt();
        int c = in.nextInt();
        System.out.println(-1);
        // your code goes here
    }
}