#include <iostream>#include <cstdio>#include <string.h>using namespace std;string ans,a,b;void build( int l1,int r1,int l2,int r2 ){ int i,len=0; if( l1>r1 || l2>r2 ) return; ans+=a[l1]; for( i=l2;i<=r2;i++,len++ ) { if( a[l1]==b[i] ) break; } build( l1+len+1,r1,i+1,r2 ); build( l1+1,l1+len,l2,i-1 );}int main(){ while( cin>>a>>b ) { int i; ans=""; build( 0,a.size()-1,0,b.size()-1 ); for( i=ans.size()-1;i>=0;i-- ) cout<<ans[i]; cout<<endl; } return 0;}
