#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()

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

    int len = N.size();
    ll ans = stoll(N);
    rep(i, 0, len-1){
        rep(j, i+1, len){
            string N2 = N;
            swap(N2[i], N2[j]);
            ans = max(ans, stoll(N2));
        }
    }
    cout << ans << endl;

    return 0;
}