#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n,c=0,d;
    cin>>n;
    string s[n];
    string t[n];
    for(int i=0;i<n;i++)cin>>s[i];
    for(int i=0;i<n;i++)cin>>t[i];
    for(int i=0;i<n;i++)if(s[i]!=t[i])d=i;
    cout<<d+1<<endl;
    cout<<s[d]<<" "<<endl;
    cout<<t[d]<<" "<<endl;
}