Q10252

import java.util.Scanner;

public class test3 {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        char[] word={'a','b','c','d','e','f',
                     'g','h','i','j','k','l',
                     'm','n','o','p','q','r',
                     's','t','u','v','w','x',
                     'y','z'};
        int[] wordInt = new int[26];


        String str1 = sc.nextLine().toLowerCase();
        String str2 = sc.nextLine().toLowerCase();

        for(int i =0 ; i<str1.length();i++){

            for(int j=0 ; j<str2.length();j++){

                if( str1.charAt(i) == str2.charAt(j) ){

                    for(int k =0 ; k<26 ; k++){
                        if(word[k] == str1.charAt(i))
                            wordInt[k]++;
                    }

                }
            }
        }

        for(int i = 0 ; i<26;i++){
            if(wordInt[i]>=1)
                    System.out.printf("%c",word[i]);
        }



    }
}