#include <bits/stdc++.h>
using namespace std;
void f(string zhong, string hou) {
	cout << hou[hou.length() - 1];
	if (zhong.length() == 1) {
		return;
	} else {
		int k = zhong.find(hou[hou.length() - 1]);
		string a = zhong.substr(0, k);
		string b = hou.substr(0, k);
		f(a, b);
		string c = zhong.substr(k + 1);
		string d = hou.substr(k, c.length());
		f(c, d);
	}
}
string z, h; 
int main() {
	cin >> z >> h;
	f(z, h);
	return 0;
}