import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            String str = sc.next();
            String substr= sc.next();
            int k=0;
            for(int i=1;i<str.length();i++){
                if(str.charAt(i) > str.charAt(k))
                {
                    k=i;
                }
            }
            System.out.println(str.substring(0,k+1)+substr+str.substring(k+1));
        }

    }
}