using System;
using System.Linq;
using System.Collections.Generic;

static class Program{
    static void Main(){
        new Magatro().Solve();
    }
}

class Magatro{
    private int N;
    private string[] A,B;
    private void Scan(){
        N = int.Parse(Console.ReadLine());
        A = Console.ReadLine().Split(' ');
        B = Console.ReadLine().Split(' ');
    }
    
    public void Solve(){
        Scan();
        for(int i = 0;i < N;i++){
            if (A[i] != B[i]){
                Console.WriteLine(i+1);
                Console.WriteLine($"{A[i]}\n{B[i]}");
            }
        }           
    }
}