#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
    #define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
        #define eprintf(...) 42
#endif

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define foreach(u,v) for(auto (u) : (v))
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<ll, ll> pll;
typedef vector<ll> vl;

const int inf = 1e9;
const ll linf = 1LL<<60;
const ll mod = 1e9 + 7;
const double eps = 1e-9;

/*
*/

int main()
{
  string s;
  cin >> s;
  int n = s.size();

  vi v;
  rep(i, n){
    v.pb(s[i]-'0');
  }

  sort(all(v));
  reverse(all(v));

  string t;

  rep(i, n){
    t += v[i] + '0'; 
  }

  rep(i, n){
    if(s[i] != t[i]){
      for(int j = n-1; j > i; j--){
        if(s[j] == t[i]){
          swap(s[j], s[i]);
          cout << s << endl;
          return 0;
        }
      }
    }
  }

  cout << s << endl;

  return 0;
}