piwo log

#include <bits/stdc++.h>

using namespace std;
/*
string lexycographicShort(string s){
    string output = "";

    for(int i = 0; i < s.length(); i++){
        output += string(1, s[i]);
        if(i+1 < s.length()){
            if(s[i] > s[i+1]){

            } else break;
        } else break;
    }

    return output;
}

string makeNick(string name, string surname){
    string output = "";
    output += lexycographicShort(name);
    output += lexycographicShort(surname);
    return output;
}*/

int main()
{
    string name, surname;
    cin>>name;
    cin>>surname;
    /*
    string login = lexycographicShort(name);
    login = lexycographicShort(login + surname);
    if(login == lexycographicShort(name)){
        login = login + string(1, surname[0]);
    }

    cout << login << endl;*/

    string s = string(1, name[0]);
    string surnameFirst = string(1, surname[0]);
    for(int i = 1; i < name.length(); i++){
        if(name[i] < surnameFirst[0]){
            s = s + string(1, name[i]);
        } else break;
    }
    s = s + surnameFirst;

    cout<<s;

    return 0;
}