func_code_string: #include <bits/stdc++.h>   using namespace std;   inline void Routine() {     srand(time(NULL));     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);   }   template <class T, class U>   istream &operator>>(istream &in, pair<T, U> &p) {     in >> p.fi >> p.se;     return in;   }   template <class T, class U>   ostream &operator<<(ostream &out, const pair<T, U> &p) {     out << p.first <<     << p.second;     return out;   }   template <class T>   istream &operator>>(istream &in, vector<T> &v) {     for (auto &i : v) {       in >> i;     }     return in;   }   template <class T>   ostream &operator<<(ostream &out, const vector<T> &v) {     for (auto &i : v) {       out << i <<   n ;     }     return out;   }   const long long mod = 1e9 + 7;   int main() {     Routine();     long long q, l1, l2, r1, r2, i;     cin >> q;     for (i = 0; i < q; i++) {       cin >> l1 >> r1 >> l2 >> r2;       if (l1 != r2) {         cout << l1 <<     << r2 <<   n ;       } else {         cout << r1 <<     << l2 <<   n ;       }     }     return 0;   }   