import java.io.*;
import java.util.*;
 
class Main {
 
    static void solution(String first,String second) {
        //    
        // write your logic here and print the desired output
        //
        String result="";
        int position=first.indexOf(second.charAt(0));
        if(position==-1)
        {
            result=first.substring(0,first.length()-1)+second.substring(1);
 
        }
        else
             result=first.substring(0,position)+second;
        System.out.println(result);
    }
// Following is the part of the program and is provided as an assistance to read the input.
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String first = in.next();
        String second = in.next();
        solution(first, second);
        in.close();
    }
}

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c21va2UsIGZvZw==

smoke, fog