import java.util.*;

public class Main{
  public static void main(String[] args){
    int i;
    Scanner sc = new Scanner(System.in);
    int num = sc.nextInt();
    String[] str1 = new String[num];
    for(i=0;i<num;i++)str1[i] = sc.next();
    String[] str2 = new String[num];
    for(i=0;i<num;i++)str2[i] = sc.next();
    for(i=0;i<num;i++){
      if(str1[i].equals(str2[i]) == false){
        System.out.println(i+1);
        System.out.println(str1[i]);
        System.out.println(str2[i]);
      }
    }
  }
}