#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    string n;
    cin >> n;
    //vector<char> chars(n.length());
    //rep(i, n.length()) chars[i] = n[i];
    rep(i, n.length()) {
        bool flg = false;
        int max_val = 0;
        int pos = 0;
        int current = stoi(""s + n[i]); 
        for(int j=i+1; j<n.length(); j++) {
            int val = stoi(""s + n[j]); 
            max_val = max(max_val, val);
            if(current < val) {
                flg = true;
                if(max_val == val) pos = j;
            }
            
        }
        if(flg) {
            swap(n[i], n[pos]);
            break;
        }
    }
    cout << n <<endl;
}