#include <iostream>
#include <vector>
#include <cmath>
#include <string>
#include <cstdio>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdlib>
#include <cstdio>
using namespace std;

#define rep(i, n) for(int (i) = (0); (i) < (n); (i++))
using ll = long long;

int main() {
    string n;
    cin >> n;

    ll ans = stoll(n);

    string s = n;
    for(int i = 0; i < s.size(); ++i){
        for(int j = i; j < s.size(); ++j){
            swap(s[i], s[j]);
            ll tmp = stoll(s);
            ans = max(ans, tmp);
            s = n;
        }
    }

    cout << ans << endl;
}