#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;

#define INF 1000000000
#define EPS 1e-9
#define PI acos(-1)

typedef long long ll;
typedef pair<int, int> P;

string str;
int ans;

int main(){

  int N;

  cin >> N;

  stringstream ss;
  ss << N;
  str = ss.str();

  int ans = 0;

  for(int i = 0; i < str.length(); i++){
    for(int j = i; j < str.length(); j++){
      swap(str[i], str[j]);
      ans = max(ans, atoi(str.c_str()));
      swap(str[i], str[j]);
    }
  }

  cout << ans << endl;

  return 0;
  
}