#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF (1LL<<25)     //33554432
#define PI 3.14159265359
#define EPS 1e-12
//#define int ll

signed main(void)
{
  string s;
  cin >> s;

  const int n = s.size();
  REP(i, n) {
    int ma = s[i] - '0', idx = i;
    bool f = false;
    FOR(j, i+1, n) {
      if((ma < (s[j]-'0')) || (f && ma == (s[j]-'0'))) {
        ma = s[j]-'0';
        idx = j;
        f = true;
      }
    }
    if(s[i]-'0' != ma) {
      swap(s[i], s[idx]);
      cout << s << endl;
      return 0;
    }
  }
  cout << s << endl;

  return 0;
}