#include <iostream>
#include <unordered_map>
#include <vector>
using namespace std;
unordered_map<char, bool> good;
unordered_map<char, bool> flag;
vector<char> res;
int main(){
    string s1, s2;
    getline(cin, s1);
    getline(cin, s2);
    for(int i = 0 ; i < s2.size(); i ++ ){
        if(s2[i] >= 'a' && s2[i] <= 'z')  s2[i] -= 32; 
        good[s2[i]] = true;
    }   
    for(int i = 0; i <s1.size(); i ++ ){
        if(s1[i] >= 'a' && s1[i] <= 'z')  s1[i] -= 32; 
        if(good.find(s1[i]) == good.end() && flag.find(s1[i]) == flag.end()){
            flag[s1[i]] = true;
            res.push_back(s1[i]);
        }  
    }
    for(auto item : res)    cout << item;
    return 0;
}