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#include <iostream>
#include <string>

using namespace std;

int main()
{
    string a,b;

    while(getline(cin,a)&&getline(cin,b)){
            int aa[26]={0},bb[26]={0};
           for(int i=0;i<a.length();i++){
                int tmp;
                tmp=a[i]-'a';
                aa[tmp]=1;
        }
          for(int i=0;i<b.length();i++){
                int tmp2;
                tmp2=b[i]-'a';
                bb[tmp2]=1;
         }
         for(int j=0;j<=26;j++){
            if(aa[j]==1&&bb[j]==1){
                    cout<< char (j+'a');
            }
         }
         cout<<endl;
    }
    return 0;
}