func_code_string: #include <bits/stdc++.h>   using namespace std;   const int M = INT32_MAX;   const int NMAX = 10007;   int main() {     cin.tie(0);     cin.sync_with_stdio(0);     cout.precision(30);     string z[2];     cin >> z[0] >> z[1];     int n;     cin >> n;     cout << z[1] <<     << z[0] << endl;     for (int i = 0; i < n; i++) {       string k, next;       cin >> k >> next;       if (k == z[1])         z[1] = next;       else         z[0] = next;       cout << z[1] <<     << z[0] << endl;     }     return 0;   };   