#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;


int main(){
  ll N;
  cin >> N;
  ll ret = N;
  vector<int> v;
  while(N>0){
    v.push_back(N%10);
    N/=10;
  }
  reverse(ALLOF(v));


  rep(i,v.size()){
    REP(j,i+1,v.size()){
      swap(v[i], v[j]);
      ll tmp = 0;
      rep(k,v.size()) tmp = 10*tmp + v[k];
      ret = max(ret, tmp);
      swap(v[i], v[j]);
    }
  }

  cout << ret << endl;
  
  return 0;
}