// No.39 桁の数字を入れ替え
// https://yukicoder.me/problems/no/39
//

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;

vector<int> find_nums(vector<int>& numbers, int target);


int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    string s;
    cin >> s;
    vector<int> N;
    for (char c: s) {
        N.push_back(c - '0');
    }
    vector<int> largest = N;
    sort(largest.rbegin(), largest.rend());

    int t1 = 0;
    int t2 = 0;
    for (auto i = 0; i < N.size(); ++i) {
        if (N[i] != largest[i]) {
            t1 = largest[i];
            t2 = N[i];
            break;
        }
    }

    if (t1 != 0) {
        vector<int> p1 = find_nums(N, t1);
        vector<int> p2 = find_nums(N, t2);
        swap(N[*(p1.end()-1)], N[*(p2.begin())]);
    }

    for (auto i: N)
        cout << i;
    cout << endl;
}


vector<int> find_nums(vector<int>& numbers, int target) {
    vector<int> res;
    for (int i = 0; i < numbers.size(); ++i) {
        if (numbers[i] == target)
            res.push_back(i);
    }
    return res;
}