#include<iostream>
using namespace std;
int main()
{
    string word1,word2;
    cin>>word1>>word2;
    string result="";
    set <char> chars1(word1.begin(),word1.end());
    for(char c:word2){
        if(chars1.count(c)){
            
        }
    }
    cout<<result<<endl;
    return 0;
}