#include <bits/stdc++.h>

int xs[12];

int dfs(bool checked[12]) {
  int res = 0;
  for(int i = 0; i < 12; ++i) {
    if( checked[i] ) continue;
    if( xs[i] == 0 ) continue;
    checked[i] = true;
    for(int j = i + 1; j < 12; ++j) {
      if( checked[j] ) continue;
      if( xs[i] == xs[j] ) continue;
      checked[j] = true;
      for(int k = j + 1; k < 12; ++k) {
        if( checked[k] ) continue;
        if( xs[j] != xs[k] ) continue;
        checked[k] = true;
        int x = 100 * xs[i] + 10 * xs[j] + xs[k];
        int x2 = x + dfs(checked);
        res = std::max(x2, res);
        checked[k] = false;
      }
      checked[j] = false;
    }
    checked[i] = false;
  }
  return res;
}

int main() {
  std::string str;
  std::cin >> str;
  bool checked[12] = {};
  for(int i = (int)str.size(); i < 12; ++i) checked[i] = true;
  for(int i = 0; i < (int)str.size(); ++i) xs[i] = str[i] - '0';
  printf("%d\n", dfs(checked));    
  
  return 0;
}