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#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <algorithm>
#include <set>
#include <utility>
#include <queue>
#include <map>
#include <assert.h>
#include <stack>
#include <string>
#include <ctime>
#include <chrono>
#define int long long int
using namespace std;



void solve()
{
	string s, t;
	cin>>s>>t;
	cout<<s[0];
	for (int i=1; i<s.size(); i++)
	{
		if (s[i]<t[0]) cout<<s[i];
		else break;
	}
	cout<<t[0];
	cout<<'\n';
}

signed main()
{
	ios::sync_with_stdio(0);
	cin.tie(NULL); cout.tie(NULL);
	int t;
	//cin >> t;
	t=1;
	

	while (t--)
	{
		solve();
	}
	return 0;
}