#include<bits/stdc++.h>
#define rep(i,N) for(ll (i)=0;(i)<(N);(i)++)
#define chmax(x,y) x=max(x,y)
#define chmin(x,y) x=min(x,y)
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
const int mod = 1000000007;
const int INF = 1001001001;

int main() {
  string s;
  cin >> s;
  int maxp = 0;
  int minp = 0;
  int n = s.length();

  rep(i, n) {
    int c = s[i] - '0';
    int maxc = s[maxp] - '0';
    int minc = s[minc] - '0';
    if (maxc <= c) maxp = i;
    if (minc > c) minp = i;
  }

  swap(s[minp], s[maxp]);

  cout << s << endl;

}