#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <string>
#include <algorithm>

using namespace std;

string answer(string& A, string& B) {
	int i;
	for(i=0; i<A.size(); ++i)
		if(A[i] > B[0]) break;
	string result = A.substr(0, i) + B + A.substr(i, A.size()-i);
	return result;
}

int main() {

	#ifndef ONLINE_JUDGE
		freopen("5120_MINSEQ.in", "r", stdin);
		freopen("5120_MINSEQ.out", "w", stdout);
	#endif

	char buff1[100001], buff2[100001];
	while(scanf("%s %s", buff1, buff2)!=EOF) {
		string str1 = buff1, str2 = buff2;
		printf("%s\n", answer(str1, str2).c_str());
	}
	return 0;
}