#include <bits/stdc++.h>
using namespace std;
#define repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define rep(i,n) repl(i,0,n)
#define mp(a,b) make_pair((a),(b))
#define pb(a) push_back((a))
#define all(x) (x).begin(),(x).end()
#define uniq(x) sort(all(x)),(x).erase(unique(all(x)),end(x))
#define fi first
#define se second
#define dbg(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
void _dbg(string){cout<<endl;}
template<class H,class... T> void _dbg(string s,H h,T... t){int l=s.find(',');cout<<s.substr(0,l)<<" = "<<h<<", ";_dbg(s.substr(l+1),t...);}
template<class T,class U> ostream& operator<<(ostream& o, const pair<T,U> &p){o<<"("<<p.fi<<","<<p.se<<")";return o;}
template<class T> ostream& operator<<(ostream& o, const vector<T> &v){o<<"[";for(T t:v){o<<t<<",";}o<<"]";return o;}

#define INF 1120000000

int main(){
  int n;
  cin>>n;
  vector<string> s(n),t(n);
  rep(i,n) cin>>s[i];
  rep(i,n) cin>>t[i];

  int cnt = 0;
  int last = 0;
  rep(i,n) if(s[i]!=t[i]) cnt++, last = i;
  cout << cnt << endl;
  rep(i,n) if(s[i]!=t[i]) cout << s[i] << " \n"[i==last];
  rep(i,n) if(s[i]!=t[i]) cout << t[i] << " \n"[i==last];

  return 0;
}