#include <bits/stdc++.h>
#include <atcoder/all>


using namespace std;
using namespace atcoder;
#define rep(i,m,n,k) for (int i = (int)(m); i < (int)(n); i += (int)(k))
#define ll long long
#define list(T,A,N) vector<T> A(N);for(int i=0;i<(int)(N);i++){cin >> A[i];}

int main(){
    
    string N;
    cin >> N ;
    ll ans = (ll)stoi(N);
    ll n = N.size();
    rep(i,0,n-1,1){
        rep(j,i+1,n,1){
            swap(N[i],N[j]);
            ans = max(ans,(ll)stoi(N));
            swap(N[i],N[j]);
        }
    }
    cout << ans << endl;

}