#include <string>
#include <iostream>
using namespace std;

string removeDuplicate(string str, int n) {
  // Used as index in the modified string
  int index = 0;
  int j;
  int size=0;
  // Traverse through all characters
  for (int i = 0; i < n; i++) {
    // Check if str[i] is present before it
    for (j = 0; j < i; j++) {
      if (str[i] == str[j]) {
        break;
      }
    }
    // If not present, then add it to result.
    if (j == i) {
      str[index++] = str[i];
      size++;
    }
  }
  str = str.substr(0,size);
  return str;
}

// Driver code
int main() {
  string str = "geeksforgeeks";
  int n = str.length() ;
  cout << removeDuplicate(str, n);
  return 0;
}