#define MAX 100
char S[MAX];
//32-126 
//0-94 95空格
int yes(char c){
    if(c - NULL >= 32 &&c - NULL <= 126) 
        if(S[c - NULL] == 0){
            S[c - NULL] = 1;
            return 1;//可以输出
        }
        else return 0;
    else if(c == ' ' && S[95] == 0){
        S[95] = 1;
        return 1;
    }
    else return 0;
}
int main()  
{
    //freopen("D:\\文件夹\\Desktop\\use.txt","r",stdin);
    //int N,M;scanf("%d %d",&N,&M);getchar();
    string s1,s2;
    getline(cin,s1);
    getline(cin,s2);
    memset(S,0,MAX);

    for(int i = 0;i< s1.length();++i){
        if(yes(s1[i])) printf("%c",s1[i]);
    }
    for(int i = 0;i< s2.length();++i){
        if(yes(s2[i])) printf("%c",s2[i]);
    }

    return 0;

}