#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef unsigned long long ull; typedef long double ld; typedef pair<ll, ll> P; #define EACH(i,a) for (auto& i : a) #define FOR(i,a,b) for (ll i=(a);i<(b);i++) #define RFOR(i,a,b) for (ll i=(b)-1;i>=(a);i--) #define REP(i,n) for (ll i=0;i<(n);i++) #define RREP(i,n) for (ll i=(n)-1;i>=0;i--) #define debug(x) cout<<#x<<": "<<x<<endl #define pb push_back #define ALL(a) (a).begin(),(a).end() const ll linf = 1e18; const int inf = 1e9; const double eps = 1e-12; const double pi = acos(-1); template<typename T> istream& operator>>(istream& is, vector<T>& vec) { EACH(x,vec) is >> x; return is; } template<typename T> ostream& operator<<(ostream& os, vector<T>& vec) { REP(i,vec.size()) { if (i) os << " "; os << vec[i]; } return os; } template<typename T> ostream& operator<<(ostream& os, vector< vector<T> >& vec) { REP(i,vec.size()) { if (i) os << endl; os << vec[i]; } return os; } int main() { std::ios::sync_with_stdio(false); std::cin.tie(0); string N; cin >> N; sort(N.begin(), N.end(), greater<char>()); cout << N << endl; }