func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s1, s2, s3, s4;     long long int n;     cin >> s1 >> s2;     cin >> n;     for (long long int i = 0; i < n; i++) {       cout << s1 <<     << s2 << endl;       cin >> s3 >> s4;       if (s1.compare(s3) == 0) {         s1 = s4;       } else {         s2 = s4;       }     }     cout << s1 <<     << s2 << endl;     return 0;   }   