#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)s; i < (int)e; ++i)
#define all(a) (a).begin(), (a).end()

int main() {
    cin.tie(nullptr);
    
    string N;
    cin >> N;
    
    int siz = N.size();
    
    vector<string> vec;
    vec.push_back(N);
    rep(i, 0, siz - 1) rep(j, i + 1, siz) {
        string tmp = N;
        swap(tmp[i], tmp[j]);
        vec.push_back(tmp);
    }
    
    sort(all(vec));
    reverse(all(vec));
    cout << vec[0] << '\n';
}