#include <iostream>
#include <stdio.h>
#include <string>
#include <list>
#include <vector>

#define rep(i,n) for(int i = 0;i < n;i++)
#define REP(i,n,k) for(int i = n;i < k;i++)
#define P(p) cout << (p) << endl;//print
using namespace std;

int main(){
    cin.tie(0);
   	ios::sync_with_stdio(false);
    int n;
    cin >> n;
    vector<string> s;
    list<string> ss;
    list<string> tt;
    int count=0;
    rep(i,n){
        string a;
        cin>>a;
        s.push_back(a);
    }
    rep(i,n){
        string t;
        cin >> t;
        if(t==s[i]){
            count++;
        }else{
            ss.push_back(s[i]);
            tt.push_back(t);
        }
    }
    cout<<count<<endl;
    cout << ss.front();
    ss.pop_front();
    for(list<string>::iterator itr = ss.begin(); itr != ss.end(); ++itr) {
        cout << " " << *itr;
    }
    cout << endl;
    cout << tt.front();
    tt.pop_front();
    for(list<string>::iterator itr = tt.begin(); itr != tt.end(); ++itr) {
        cout << " " << *itr;
    }
    cout << endl;

    
    return 0;
}