#include <bits/stdc++.h>
using namespace std;

string dfs(string z,string q,int step){
	if (z.length()<=1)  return z;
	int tmp=z.length()-1;
	char root=q[tmp];
	//cout<<root<<" "; 
	int pos=z.find(root);
	string z_l=z.substr(0,pos);
	//cout<<z_l<<" ";
	string z_r=z.substr(pos+1);
	//cout<<z_r<<" ";
	string q_l=q.substr(0,z_l.length());
	//cout<<q_l<<" ";
	string q_r=q.substr(z_l.length());
	//cout<<q_r<<endl;
	return root+dfs(z_l,q_l,step-1)+dfs(z_r,q_r,step-1);
}

int main(){
	string sz,sq;
	cin>>sz>>sq;
	cout<<dfs(sz,sq,0);
	return 0;
} 
/*
zhong:
hou:
ABEDFCHG
AEFDBHGC
qian:CBADEFGH 
*/