#include <iostream>

 #include <cstdio>

 #include <cstring>

 #include <algorithm>

 using namespace std;

 char ch1[],ch2[];

 int len1,len2;

 int dfs(int s,int e,int a,int b)

 {

     int i,j;

     if(s>e)

         return ;

     printf("%c",ch2[e]);

     if(s==e)

         return ;

     for(i=a;i<=b;i++)

         if(ch1[i]==ch2[e])

             break;

     int l=i-a,r=b-i;

     dfs(s,s+l-,a,i-);

     dfs(s+l,e-,i+,b);

     return ;

 }

 int main()

 {

     freopen("in.txt","r",stdin);

     while(scanf("%s%s",ch1,ch2)!=EOF)

     {

         len1=strlen(ch1),len2=strlen(ch2);

         dfs(,len2-,,len1-);

         printf("\n");

     }

 }