#include <iostream> #include <string> using namespace std; int main() { int n; cin >> n; cin.get(); for (int i = 0; i < n; ++i) { string s1, s2; getline(cin, s1); getline(cin, s2); int mid = s1.length() / 2; string ss = s1.substr(0, mid) + s2 + s1.substr(mid); cout << ss << endl; } return 0; }