func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s[1005], ss[1005];     cin >> s[0] >> ss[0];     int n;     cin >> n;     for (int i = 1; i <= n; i++) cin >> s[i] >> ss[i];     for (int i = 0; i <= n; i++) {       if (i == 0) {         cout << s[0] <<     << ss[0] << endl;         continue;       } else if (s[i] == s[i - 1]) {         s[i] = ss[i];         ss[i] = ss[i - 1];         cout << s[i] <<     << ss[i] << endl;       } else if (s[i] == ss[i - 1]) {         s[i] = s[i - 1];         cout << s[i] <<     << ss[i] << endl;       }     }     return 0;   }   