10252

#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;

int main() {
    char stra[1000],strb[1000], ansstr[1000];
    while (scanf("%s%s", stra,strb)==2) {
        int i,j,k=0;
        int len1 = strlen(stra);
        int len2 = strlen(strb);
        for (i=0;i<len1;i++) {\
            for (j=0;j<len2;j++) {
                if (stra[i] == strb[j]) {
                    strb[j] = '\0';
                    ansstr[k] = stra[i];
                    k++;
                    break;
                }
            }
        }

        sort(ansstr, ansstr+(k));
        for (i=0;i<k;i++) printf("%c",ansstr[i]);
        printf("\n");
    }
    return 0;
}