#pragma GCC optimize("Ofast")
#pragma GCC optimize("O3")
#include <bits/stdc++.h>

#define el '\n'
#define F first
#define S second

typedef long long ll;
typedef long double ld;
typedef __int128 bigInt;

using namespace std;

const int N = 4e5 + 5, INF = 1e9 + 5, mod = 1e9 + 7, LOG = 21, SQ = 500;



void doWork() {
    string s, t;
    cin >> s >> t;
    string a = "";

    reverse(s.begin(), s.end());
    reverse(t.begin(), t.end());

    while (s.size() and t.size()) {
        if (s.back() < t.back()) {
            a += s.back();
            s.pop_back();
        }
        else {
            a += t.back();
            t.pop_back();
        }
    }

    while (s.size()) {
        a += s.back();
        s.pop_back();
    }

    while (t.size()) {
        a += t.back();
        t.pop_back();
    }

    cout << a << el;
}

int main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

    int tests = 1;
//    cin >> tests;
    for (int i = 1; i <= tests; i++) {
        doWork();
    }
}