dtShop.java

import java.util.*;
import java.lang.String;

public class dtShop {
 public static void main(String[] args) {
 Scanner sc = new Scanner(System.in);
 int n =sc.nextInt();
 String T1 = sc.nextLine();
 int t[] = new int[3];
 for(int i = 0; i < n; i++) {
 t[i] = (int) T1.charAt(i);
 }
 String T2 = sc.nextLine();
 int j[] = new int[3];
 for(int i = 0; i < n; i++) {
 j[i] = (int) T2.charAt(i);
 }
 sc.close();
 int minT = Math.min(t[1],Math.min(t[2],t[3]));
 int minJ = Math.min(j[1],Math.min(j[2],j[3]));
 if(minT+minJ >n ) System.out.println(-1);
 else {
 
 }
 }
}