#include <bits/stdc++.h>
using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  string s;
  cin >> s;

  vector<char> digits;
  for (char c : s) {
    if (isdigit(c))
      digits.push_back(c);
  }

  int m = digits.size();
  string result = "";
  int pos = 0;

  for (int need = 5; need > 0; need--) {
    char best = '0';
    int bestPos = pos;

    for (int i = pos; i <= m - need; i++) {
      if (digits[i] > best) {
        best = digits[i];
        bestPos = i;
      }
    }

    result.push_back(best);
    pos = bestPos + 1;
  }

  cout << result;
  return 0;
}