#include <bits/stdc++.h>
using namespace std;
int main() {
std::string s, t;
getline(cin, s);getline(cin, s); getline(cin, t);
stringstream ss(s), tt(t);
int cnt = 1;
for (;;) {
ss >> s; tt >> t;
if(s != t) {
cout << cnt << "\n" << s << "\n" << t << "\n";
exit(0);
}
cnt++;
}
}