#include <iostream>
#include <algorithm>
 
using namespace std;
 
int main() {
    string line1, line2, ans;
    while (cin >> line1 >> line2){;
    	ans.clear();
        for(auto i : line1){
            for (int j = 0; j < line2.size(); ++j){
                if (i == line2[j]){
                    ans += i;
                    line2.erase(line2.begin() + j);
                    --j;
                    break;
                }
            }
        }
        sort (ans.begin(), ans.end());
        cout << ans <<'\n';
    }
}

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cHJldHR5CndvbWVuCndhbGtpbmcKZG93bgp0aGUKc3RyZWV0

pretty
women
walking
down
the
street