#include<bits/stdc++.h>
using namespace std;
string preorder(string inorder,string postorder)
{
	if(inorder.length()<=1)
		return inorder;
	char root=postorder[postorder.length()-1];
	int pos=inorder.find(root);
	string inorder_left=inorder.substr(0,pos);
	string inorder_right=inorder.substr(pos+1);
	string postorder_left=postorder.substr(0,inorder_left.length());
	string postorder_right=postorder.substr(inorder_left.length(),inorder_right.length());
	return root+preorder(inorder_left,postorder_left)+preorder(inorder_right,postorder_right);
}
int main()
{
	string inorder,postorder;
	cin>>inorder>>postorder;
	cout<<preorder(inorder,postorder)<<endl;
	return 0;
}