#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a; i < n; i++)
#define per(i,n,a) for (int i = n - 1; i >= a; i--)
using namespace std;

int main() {
    string s;
    cin >> s;
    vector<string> ans;
    ans.push_back(s);
    rep(i, 0, s.size()) {
        rep(j, 0, s.size()) {
            string tmp = s;
            swap(tmp[i], tmp[j]);
            ans.push_back(tmp);
        }
    }
    sort(ans.rbegin(), ans.rend());
    cout << ans[0] << endl;
}