func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int i, j, k, l, m, n, p, x, y;     string s1, s2, s3, s4;     cin >> s1 >> s2;     cin >> n;     cout << s1 <<     << s2;     cout << endl;     for (i = 0; i < n; i++) {       cin >> s3 >> s4;       if (s3 == s1) {         s1 = s4;         cout << s1 <<     << s2;       }       if (s3 == s2) {         s2 = s4;         cout << s1 <<     << s2;       }       cout << endl;     }   }   