#include <bits/stdc++.h>
#define int long long // 仅在需要大整数时使用，memset 数组为 0x3f 时去掉
#define INF 0x3f3f3f3f
#define PII pair<int, int>
#define ULL unsigned long long
#define PIII tuple<int, int, int>
#define all(v) v.begin(), v.end()
#define debug(a) cout << #a << " = " << a << endl;
using namespace std;
constexpr int N = 1 * 1e6 + 10, M = 5 * 1e3 + 10;


void solve() {
    string num;
    cin >> num;
    int zero = count(all(num), '0');
    sort(all(num));
    bool f = false;
    for (auto c : num) {
        if (c == '0') 
            continue;
        else if (!f){
            cout << c;
            for (int i = 0; i < zero; i ++) cout << "0";
            f = true;
        } else {
            cout << c;
        }
    }
}

signed main() {
    ios::sync_with_stdio(0); cin.tie(nullptr), cout.tie(nullptr);
    int _ = 1;
    // cin >> _;
    while (_--) {
        solve();
    }
    return 0;
}

/**
 *    author: Nijika_jia
 *    description: C++17 Algorithm Template for Competitive Programming
 */