#include <bits/stdc++.h>
using namespace std;
char a[30],b[30],c[30];
int Al;
int qwe = 0;
void fd(int l,int r){
	qwe++;
	cout << c[r];
	int point=0;
	if(l == r)return;
	for(int i = 0;i<=Al-1;i++){
		if(b[i] == c[r]){
			point = i;
			break;
		}
	}
	if(l < point){
		bool x[3000]={0};
		for(int i = l;i<point;i++){
			for(int j = 0;j<Al;j++){
				if(b[i] == c[j]){
					x[j] = 1;
				}
			}
		}
		int st=-1,ed=-1;
		bool hx = 0; 
		for(int i = 0;i<Al;i++){
			if(hx == 0 && x[i] == 1){
				hx = 1;
				st = i;
			}else if(hx == 1 && x[i] == 0){
				hx = 0;
				ed = i-1;
			}
		}
		fd(st,ed);
	}
	if(r > point){
		bool x[3000]={0};
		for(int i = point+1;i<=r;i++){
			for(int j = 0;j<Al;j++){
				if(b[i] == c[j]){
					x[j] = 1;
				}
			}
		}
		int st=-1,ed=-1;
		bool hx = 0; 
		for(int i = 0;i<Al;i++){
			if(hx == 0 && x[i] == 1){
				hx = 1;
				st = i;
			}else if(hx == 1 && x[i] == 0){
				hx = 0;
				ed = i-1;
			}
		}
		fd(st,ed);
	}
}
int main(){
	cin >> b >> c;
	Al = strlen(b);
	fd(0,Al-1);
}