#include<bits/stdc++.h> #define itsmdshahin ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0) #define ll long long #define MX 1000006 const int N = 100100; using namespace std; vector<ll>g[N]; int main() { itsmdshahin; ll n,z=0; cin >> n; vector<ll>a; string t="abcdefghijklmnopqrstuvwxyz",s;cin >> s; for(int j=0;j<s.size();j++){ for(int i=t.size()-1;i>=0;i--){ if(s[j]==t[i]){ a.push_back(i); } } } reverse(t.begin(),t.end()); for(int j=0;j<a.size();j++){ for(int i=0;i<t.size();i++){ if(a[j]==i){ cout << t[i]; } } } cout << endl; }