#include <iostream> #include <string> using namespace std; int main() { int n; cin >> n; // 吃掉换行，防止getline读空 cin.ignore(); while(n--) { string s1, s2; getline(cin, s1); getline(cin, s2); int mid = s1.size() / 2; string ans = s1.substr(0, mid) + s2 + s1.substr(mid); cout << ans << endl; } return 0; }