#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <algorithm>
#include <numeric>
#include <functional>
#include <set>
#include <sstream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <cctype>
#include <climits>

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define FOE(i,a) for(auto i : a)
#define ALL(c) (c).begin(), (c).end()
#define EXIST(v, n) (std::find(v.begin(), v.end(), 1) != v.end())

using namespace std;


// intの各桁を配列に格納する
vector<int> int_to_vector(int n) {
    vector<int> v;
    while (n > 0) {
        v.push_back(n % 10);
        n /= 10;
    }
    reverse(v.begin(), v.end());
    return v;
}

int main(int argc, char *argv[]) {
    int N;
    cin >> N;
    vector<int> v = int_to_vector(N);
    REP(i, v.size() - 1) {
        int m = 0, swap_index = 0;
        FOR(j, i + 1, v.size()) {
            if (v[i] < v[j] && m <= v[j]) {
                m = v[j];
                swap_index = j;
            }
        }
        if (m != 0) {
            swap(v[i], v[swap_index]);
            break;
        }
    }
    string ans = "";
    for_each(ALL(v), [&](int n) {ans += to_string(n); });
    cout << ans << endl;
}