#include #include using namespace std; int main(){ int n; cin >> n; string s[n]; string t[n]; for(int i = 0; i < n; i++) cin >> s[i] >> t[i]; for(int i = 0; i < n; i++){ if(s[i] != t[i]){ cout << i+1 << endl; cout << s[i] << endl; cout << t[i] << endl; } } return 0; }